GA32-0039-1
File No. 8370-00

Systems

IBM Input / Output
Device Summary-------- ----------- -- ----_~_9_®

Second Edition (July 1980)
This a major revision that replaces GA32-0039-0 and its Technical Newsletters, GN32-0126
and GN32-0142, and makes them all obsolete. Changes are continually made to the information
herein; before using this publication in connection with the operation of IBM systems, consult thelatest IBM System/370 Bibliography, GC20-0001, for the editions that are applicable and current.
References in this publication to IBM products, programs, or services do not imply that IBM
intends to make these available outside the United States.
Publications are not stocked at the address given below; requests for IBM publications should bemade to your local IBM representative or to the IBM branch office serving your locality.
A form for reader's comments is supplied at the back of this publication. If the form has been
removed, comments may be addressed to IBM Corporation, General Products Division,
Information Development, Department 61C, Tucson, Arizona, U.S.A. 85744. IBM may use or
distribute any of the information you supply in any way it believes appropriate without incurring
any obligation whatever. You may, of course, continue to use the information you supply.
~ Copyright International Business Machines Corporation 1978, 1980

Preface
This publication has general information about IBM
input/output (I/O) equipment (devices and systems)
that can operate locally with the IBM processors.
More specifically, only equipment sold through the
IBM Data Processing Division and not through the
IBM General System Division are described herein.
These devices and systems can be attached to achannel or to an integrated adapter on the processor.
The purpose of this publication is to summarize
high-level information of IBM I/O devices andsystems for easy reference and comparison. The
primary audiences for this publication are customer
executives, data processing managers, IBM Data
Processing Division managers and IBM marketing
representatives who need a general overview of thevarious IBM I/O equipment.
Input/output devices and systems that can be locallyattached to a specific IBM processor are listed in
the input/output configura tor for that processor.
For example, see IBM System/370 Input/Output
Configura tor, for System/370 I/O configurations.

Major Divisions of This Publication
This publication is divided into 13 chapters and one
appendix. Each chapter is about devices that are
similar in the work performed or storage device
used, as follows:• "Chapter 1. Audio Communications Devices"
describes the characteristics of the 7770 Audio
Response Unit.

• "Chapter 7. Magnetic Tape Devices" describes
and summarizes the characteristics of themagnetic tape devices.
• "Chapter 8. Optical Readers" describes andsummarizes the characteristics of the opticalreaders.
• "Chapter 9. Printer-Keyboards" describes thecharacteristics of the 3215 Printer Keyboard.
• "Chapter 10. Printers" describes and summarizes
the characteristics of serial, line, and page
printers. Printers that are a part of a system aredescribed in Chapter 13.
• "Chapter 11. Punched Card Devices" describes
and summarizes the characteristics of card
readers, card punches, and card printers.
• "Chapter 12. Punched Tape Devices" describes
the characteristics of the 2671 Paper Tape
Reader.
• "Chapter 13. Systems" describes thecharacteristics of systems that can attach to ahost processor similar to an input/output device.
• "Appendix A. I/0 Attachment Data" consists ofa chart showing the I/O devices and systems andtheir means of attachment to a processor.

Related Publications
The following publications are referred to in thispublication:• "Chapter 2. Auxiliary Processors" describes thecharacteristics of the 3838 Array Processor andthe 3848 Cryptographic Unit.

• An Introduction to the IBM 3250 Graphics
Display System, GA33-3035 contains
introductory information on the 3250.

• "Chapter 3. Direct Access Storage Devices"
describes and summarizes the characteristics ofthe direct access devices that use the magnetic
disk to store data.

• IBM Data Communication Device Summary,
GA27-3I85, describes the devices that use
communication systems to communicate with ahost system.

• "Chapter 4. Diskette Input/Output Devices"
describes the characteristics of the 3540 Diskette
Input/Output Unit.

• IBM Data Processing Glossary, GC20-I699,
contains definitions of terms used in the dataprocessing field.

• "Chapter 5. Display Devices" describes thecharacteristics of the cathode-ray tube display
stations.

• IBM System/370 Input/Output Configurator,
GA22-7002, contains information on devices andsystems that can be locally attached to, andcommunicate over communication lines with, aSystem/370.

• "Chapter 6. Magnetic Character Readers"
describes and summarizes the characteristics ofthe magnetic character readers.

• IBM 3270 Information Display System: Colorand Programmed Symbols, GA33-3056 describes
in detail programming support information.

Prefaceiii• IBM 3270 Information Display System
Configurator, GA27-2849 describes the various
devices that are a part of the 3270 system.
• Tape Requirements for IBM One-Half Inch Tape
Drives at: 556, 800, 1600, and 6250 BPI,
GA32-0006-5, describes the tape requirements for
IBM one-half inch magnetic tape devices.

iv

IBM Input/Output Device Summary• OperatorjRefe,rence Manual for the IBM 3800
Tape-To-Printing Subsystem Feature,
GA26-1654, contains operating instructions andprogramming information for the IBM 3800
tape-to-printing subsystem feature.

Summary of Amendments
Major Technical Changes - Second
EditionElimination of the Vertical Change Bar
This publication has been completely arranged andformatted again for easy reference. Each device
section is now a chapter and each topic is now
highlighted. The change bar is not used in thisedition because the new arrangement and format
would result in a change bar on the left margin
throughout the publication.
Update of Input/Output Equipment Dataequipment has been added. This has also been done
for different models of the equipment.
Mention of System/360 Processors
The mention of the System/360 processors has been
removed because they can no longer be ordered,although there are many still in use today.
Metric Conversion
All measurements have been converted toInternational System of Units (SI). All standards ofmeasurements such as bytes per inch and characters
per inch have not been converted to metricmeasurements.

As part of the updating procedure, equipment thatis no longer available has been deleted and new

Summary of Amendmentsv

Contents
Preface . . . . . . . . . . . . . .
Major Divisions of This Publication.
Related Publications. . .

. iii
. iii
. iii

Summary of Amendments. v

Chapter 1. Audio Communication Devices
7770 Audio Response Unit Model 3 . .
Special Features . . . . . . . . . .

1-1
1-1
1-1

Chapter 2. Auxiliary Processors . . . . .
3838 Array Processor Models 1 through 3 .
Special Features . . . . . . . . . .
3848 Cryptographic Unit Modell. . .

2-1
2-1
2-2
2-2

Chapter 3. Direct Access Storage Devices
2835 Storage Control
Special Features .
3830 Storage Control
Special Features .
3880 Storage Control
Special Features .
2305 Fixed Head Storage
3310 Direct Access Storage. . . . . . . .
3333 Disk Storage and Control and 3330 Disk Storage.
Special Features . . . . . . . . . . . . . . . . .
3340 and 3344 Direct Access Storage.
Special Features for the 3340
3350 Direct Access Storage
Special Features . . . .
3370 Direct Access Storage
Special Features . . . .
Data Comparison Tables. .

3-1
3-1
3-2
3-2
3-2
3-3
3-4
3-5
3-5
3-6
3-6
3-7
3-8
3-8
3-9
3-9
3-10
3-11

Chapter 4. Diskette Input/Output Devices . . . . . .
3540 Diskette Input/Output Unit Models B1 and B2 .

4-1
4-1

Chapter 5. Display Devices
3251 Display Station Model 1
Special Features . . . . .
.
3277 Display Station Models 1 and 2 with
3272 Control Unit Models 1 and 2 or
3274 Control Unit Models lA, 1B, and 1DSpecial Features . . . . . . . . . . .
3278 Display Station Models 1 through 5 with
3274 Control Unit Models lA, 1B, and 1D . .
Special Features . . . . . . . . . . . . . . . . .
3279 Color Display Station Models 2A, 2B, 3A, and 3B
Special Features . . . . . . . . . . . . .
Programming Support . . . . . . . . . .
8775 Display Terminal Models 1,2, ll, and 12
Special Features . . . . . . . . . . . . .
Programming Support . . . . . . . . . .

5-1
5-1
5-2

Chapter 6. Magnetic Character Readers. . . . . .
1255 Magnetic Character Reader Models 1, 2, and 3
Special Features . . . . . . . . . . .
1419 Magnetic Character Reader Modell
Special Features . . . . . . . . . . . . . .
3890 Document Processor Models Al through A6,
and B 1 through B6 . . .
Special Features . . .
Data Comparison Tables .

6-1
6-1
6-2
6-2
6-3

5-2
5-3
5-3
5-4
5-5
5-5
5-6
5-6
5-6
5-8

6-4
6-5
6-5

7-1

Chapter 7. Magnetic Tape Devices . . . . . . . . . . . .
3410 Magnetic Tape Unit Models 1 through 33411 Magnetic Tape Unit and Control
Models 1 through 3. . . . . . . . . . . . .
Special Features . . . . . . . . . . . . .
3420 Magnetic Tape Unit Models 3 through 8 .
Special Features . . . . . . . . ,...
3803 Tape Control Models 1, 2, and 3 . . . .
Special Features . . . . . . . . . . . . . .
8809 Magnetic Tape Unit Models lA, IB, 2, and 3
Special Features . . . .
Data Comparison Table . . . . . . . .

7-1
7-2
7-2
7-4
7-4
7-5
7-5
7-6
7-6

Chapter 8. Optical Readers . . . . . .
1287 Optical Reader Models 1, 3, and 5
Special Features . . . . . . .
1288 Optical Page Reader Modell.
Special Features . . . . . . . .
3881 Optical Mark Reader Model 1
Special Features . . . . . . . .
3886 Optical Character Reader Model 1
Special Features . . . . .
Data Comparison Table . . . . . . . .

8-1
8-1
8-2
8-2
8-3
8-4
8-4
8-5
8-6
8-6

Chapter 9. Printer-Keyboards . . . . .
3215 Console Printer-Keyboard Modell

9-1
9-1

Chapter 10. Printers . . . . . .
1403 Printer Models 2, 7, and N 1
Special Features . .
1443 Printer Model N1 . . . . .
Special Features . . . . . . . .
.
2821 Control Unit Models 1, 2, 3, 5, and 6
Special Features . . . . . .
3203 Printer Models 1 through 5
Special Features
32ll Printer . . . . . . . . .
Special Features . . . . . .
.
....
3262 Line Printer Models 1, 2, 3, II, 12, and 13
3800 Printing Subsystem
Special Features . . . . . . .
3811 Printer Control Unit Model 1
5203 Printer Model 3
Special Features . .
5213 Printer Modell.
Data Comparison Table

10-1
10-1
10-2
10-3
10-3
10-3
10-4
10-4
10-5
10-5
10-6
10-6
10-9
lO-ll
10-12
10-12
10-13
10-13
10-14

Chapter 11. Punched Card Devices
1442 Card Read Punch Model N1
Special Features . . . . . . .
1442 Card Punch Model N2 : . .
2501 Card Reader Models B1 and B2
Special Features . . . . . . .
2520 Card Read Punch Model B1 .
Special Features . . . . . . . .
2520 Card Punch Models B2 and B3Special Features . . . . . .
2540 Card Read Punch Modell . .
Special Features . . . . . . . .
....... .
2560 Multi-Function Card Machine Models Al and A2
Special Features . . . . . . . . .
3504 Card Reader Models Al and A2
Special Features . . . . . . . . .

ll-l
11-1
11-2
11-2
11-2
11-3
11-3
11-3
11-4
11-4
11-4
11-4
11-5
11-6
11-6
11-6

Contentsvii

3505 Card Reader Models Bl and B2
Special Features . . . . . . . . .
3525 Card Punch Models PI, P2, and P3Special Features . . . . . . . . . .
5425 Multi-Function Card Unit Models Al and A2
Data Comparison Table . . . . .

11-7
11-8
11-8
11-9
11-9
11-11

Chapter 12. Punched Tape Devices
2671 Paper Tape Reader
Special Features . . . . . . .
2822 Paper Tape Reader Control.

12-1
12-1
12-1
12-2

Chapter 13. Systems
3250 Graphics Display System
3251 Display Station . . .
3255 Display Control Unit
3258 Control Unit . . . .
3270 Information Display System
3272 Control Unit (Local Attachment)
Models 1 and 2 . . . . . . . . . . .
3274 Control Unit Models lA, IB, and ID .
3277 Display Station Models 1 and 2 . . .
3278 Display Station Models 1 through 5 .
3279 Color Display Station Models 2A, 2B,
3A, and 3B . . . . . . . .
3284 Printer Models 1 and 2 . . . .
3286 Printer Models 1 and 2 . . . .
3287 Printer Models 1, lC, 2 and 2C
3288 Line Printer Model 2 '. . . . .

13-1
13-1
13-2
13-2
13-3
13-3
13-4
13-4
13-5
13-5
13-6
13-6
13-6
13-7
13-7

3289 Line Printer Models 1 and 2 . . . . .
Special Features . . . . . . . . . . . . .
3730 Distributed Office Communication System
3732 Text Display Station . . . . . . . .
3736 Printer. . . . . . . . . . . . . . .
3791 Controller Models 11C, 12A, and 12B
3790 Communication System . . . . . .
3791 Controller Models lC, 2A, and 2B
3792 Auxiliary Control Unit . . . . .
3793 Keyboard-Printer . . . . . . . .
3790 Communication System-Miscellaneous Equipment.
2741 Communication Terminal . . .
3277 Display Station Models 1 and 23284 Printer Models 1 and 2
3286 Printer Models 1 and 2 . . . .
3288 Line Printer Model 2 . . . . .
3790 Communication System/Data Entry Configuration
3760 Key Entry Station Models 1,2, and 33762 Payment Transaction Processor
3850 Mass Storage System
3851 Mass Storage Facility . .
Staging Adapter . . . . . . .
Direct Access Storage Devices

13-8
13-8
13-9
13-9
13-9
13-10
13-10
13-11
13-11
13-11
13-12
13-12
13-12
13-12
13-12
13-12
13-12
13-12
13-13
13-13
13-14
13-15
13-15

Appendix A. I/O Attachment Data

· A-I

Glossary and Abbreviations •

• G-l

Index

• 1-1

FiguresFigureFigureFigureFigureFigure

1-1.
2-1.
2-2.
2-3.
3-1.

FigureFigureFigureFigureFigureFigureFigureFigureFigureFigure

3-2.
3-3.
3-4.
3-5.
3-6.
3-7.
3-8.
3-9.
3-10.
3-11.

Figure3-12.

Figure3-13.

Figure3-14.

Figure3-15.

Figure4-1.

FigureFigureFigureFigureFigure

5-1.
5-2.
5-3.
5-4.
5-5.

viii

IBM 7770 Audio Response Unit . .
IBM 3838 Array Processor. . . . . .
IBM 3848 Cryptographic Unit Modell
Personalization/Key Entry Unit andOperator Panel....
..
IBM 2835 Storage Control andIBM 2305 Fixed Head Storage
IBM 3830 Storage Control .
IBM 3880 Storage Control . .
IBM 3310 Direct Access Storage
IBM 3330 and 3333 Disk Storage
IBM 3340 Direct Access Storage Facility
IBM 3344 Direct Access Storage
IBM 3348 Data Module . . .
IBM 3350 Direct Access Storage
IBM 3370 Direct Access Storage
Comparison of Features for Storage
Controls and Disk Storage . . . .
Comparison of Characteristics for
Storage Controls .
. . . .
Comparison of Characteristics for
Disk Storage
Comparison of Capacities for
Disk Storage. .
Comparison of Performance for
Disk Storage..
..
IBM 3540 Diskette Input/Output Unit
Model B2 .
. . . .
IBM 3251 Display Station
IBM 3277 Display Station
IBM 3278 Display Station
IBM 3279 Color Display Station
IBM 8775 Display Terminal

IBM Input/Output Device Summary

1-1
2-1
2-3

Figure2-4

Figure

3-1
3-2
3-4
3-5
3-6
3-7
3-7
3-8
3-9
3-10

Figure

3-11

FigureFigureFigureFigureFigureFigureFigureFigureFigure

3-12
3-12
3-13
3-13
4-1
5-2
5-3
5-4
5-6
5-6

FigureFigureFigureFigureFigureFigureFigureFigureFigureFigure6-1. IBM 1255 Magnetic Character Reader
Modell or 2
.....
. .
6-2. IBM 1255 Magnetic Character Reader
Model 3
. . . .
. .
6-3. The 14 Magnetic-Ink Characters ofFont E13B . .
. ..
. ...
6-4. Magnetic Inscription-Translation ofCharacters and Definitions of Fields .
6-5. IBM 1419 Magnetic Character Reader
6-6. IBM 3890 Document Processor
Model A3 .
. .
6-7. Comparison Data for Magnetic
Character Readers .
..
7-1. IBM 3410 Magnetic Tape Unit
Models 1, 2, or 3..
7-2. IBM 3420 Magnetic Tape Unit.
7-3. IBM 3803 Tape Control Unit Model 1
7-4. IBM 8809 Magnetic Tape Unit.
7-5. Comparison of Characteristics for
Magnetic Tape Devices. .
8-1. IBM 1287 Optical Reader ModelS
8-2. Fonts, Letters, and Symbols Readby the 1287 .
. .
8-3. IBM 1288 Optical Page Reader
8-4. IBM 3881 Optical Mark Reader
8-5. IBM 3886 Optical Character Reader
8-6. Fonts, Letters. Numbers, and Symbols
Read by the 3886 Model 1
8-7. Comparison Data of Optical
Character Readers .
..
9-1. IBM 3215 Console Printer-Keyboard
10-1. IBM 1403 Printer Models 2 and 7
10-2. Selective Tape Characteristics
for the 1403 .
. . . .

6-1
6-1
6-2
6-3
6-3
6-4
6-5
7-2
7-4
7-5
7-6
7-7
8-1
8-2
8-3
8-4
8-5
8-5
8-6
9-1
10-1
10-2

FigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigure

10-3.
10-4.
10-5.
10-6.

IBM 1403 Printer Model Nl
IBM 1443 Printer Model Nl
IBM 3203 Printer . . . . .
IBM 3211 Printer and 3811 PrinterControl Unit . . . . . . .
..
10-7. IBM 3262 Line Printer . . . . .
10-8. Comparison of 3262 Printer Rated
Speeds . . . . . . . . . . . . .
10-9. Attachment of IBM 3262 Models 1
and 11 to a 4331 Processor . . . .
10-10. Attachment of IBM 3262 Models 2
and 12 to an 8130 or 8140 Processor
10-11. Attachment of IBM 3262 Models 3
and 13 to a 3274 or 3276 Control Unit
10-12. IBM 3800 Printing Subsystem
10-13. 3800 Print Speed Ranges
10-14. Path of Paper Forms through the3800 Printing Subsystem . .
10-15. IBM 5203 Printer Model 3. .
10-16. IBM 5213 Printer Modell . .
10-17. Comparison Data for Printers11-1. 80- and 96-Column Cards
11-2. IBM 1442 Card Punch Model N2
11-3. IBM 2501 Card Reader . . . . .
11-4. IBM 2520 Card Read Punch Model Bl
11-5. Card Path in the 2520 Card Read
Punch Model Bl . . . . .
11-6. IBM 2540 Card Read Punch.
11-7. IBM 2560 Multi-Function Card
Machine . . . . . . . . . . .
11-8. IBM 3504 or 3505 Card Reader
11-9. IBM 3525 Card Punch
11-10. IBM 5425 Multi-Function Card Unit
with System/370 Model 115 . . .
11-11. Comparison Data for Card Devices .
12-1. IBM 2671 Paper Tape Reader andIBM 2822 Paper Tape Reader Control
13-1. IBM 3250 Graphics Display System
13-2. IBM 3251 Display Station . . . . . .

10-2
10-3
10-4

Figure10-5
10-6

Figure10-6

FigureFigureFigureFigure10-7

Figure

10-8
10-8
10-9
10-10
10-11
10-13
10-13
10-14
11-1
11-2
11-2
11-3
11-4
11-4

FigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigureFigure

11-5
11-7
11-9
11-10
11-11

FigureFigureFigure

12-1
13-1
13-2

13-3. IBM 3255 Display Control Unit or
IBM 3258 Control Unit...
13-3
13-4. Simplified Configuration of a 3250
System . . . . . . . . . . . .
13-3
13-5. IBM 3270 Information Display SystemLine Printer, Display Terminals,
and Control Unit . . . . . . . . .
13-4
13-6. IBM 3277 Display Station Model 2 .
13-5
13-6
13-7. IBM 3278 Display Station . . . . .
13-6
13-8. IBM 3279 Color Display Station . .
13-9. IBM 3284 Models 1 and 2 or IBM 3286
Printer Models 1 and 2
13-7
13-10. IBM 3287 Printer . . . . . .
13-7
13-11. IBM 3288 Line Printer Model 2
13-8
...
13-8
13-12. IBM 3289 Line Printer13-9
13-13. IBM 3732 Text Display Station
13-14. IBM 3736 Printer . . . .
13-10
13-15. IBM 3791 Controller withLine Printer Feature. . .
13-10
13-16. IBM 3790 Communication System
13-10
13-11
13-17. IBM 3792 Auxiliary Control Unit
13-18. Print Rates of the Line PrinterAttachment to the 3791 and 3792 .
13-11
13-19. IBM 3793 Keyboard-Printer . . .
13-12
13-20. IBM 2741 Communication Terminal
13-12
13-21. IBM 3760 Dual Key Entry Station
13-13
13-22. IBM 3762 Payment Transaction
Processor . . . . . . . . . .
13-13
13-23. IBM 3850 Mass Storage System with
3851 Mass Storage Facility, System/370
Model 158 and 3330 Disk Storage
13-14
13-24. Characteristics of the IBM 3851
Mass Storage Facility Models
13-15
13-25. Logical Units of the Mass Storage
System . . . . . . . . . . . .
13-16
A-I. Attachment Data for Local
I/O Equipment ..................... A-I

Contentsix

Chapter 1. Audio Communication Devices
The audio communication devices supply audio
responses to digital inquiries from telecommunication devices.

7770 Audio Response Unit Model 3
The 7770 Audio Response Unit Model 3 (Figure1-1) supplies a composed audio response to digitalinquiries from a 1001 Data Transmission Terminal,a telephone set, or other inquiry-type terminals.
The highlights of the 7770 follow.

32-Word Vocabulary
Each 7770 comes with a 32-word vocabulary thatcan be expanded with a special feature. Vocabulary
words can be specified by the user as described by
the message specifications. However, lengthy words
must be divided and will be considered as twowords. The vocabulary can be changed at any timeby removing the drum and replacing it with anotherthat has a different vocabulary. One word of eachuser vocabulary must be silence.

Voice Communication
The spoken response is composed from an
American-English vocabulary recorded earlier in amale or female voice on a magnetic drum inside the7770. The response is transmitted over suitablecommon-carrier communication facilities back to theinquiring terminal. When the 7770 is operating inconversational mode, the inquiry-response sequencecan be repeated any number of times without
dialing the 7770 again.
Operation
To make an inquiry of the 7770, the calling party
enters a series of characters from his or her
terminal. The 7770 passes these characters one by
one through the byte multiplexer channel to theprocessor, which processes the inquiry and sends a
response message back, character by character, tothe 7770. This response message is a series of drum
word addresses that the 7770 uses to select thecorrect words for its spoken reply. There are no
limits to the length of the inquiry or of the response.
Attachment to a Processor
The 7770 Audio Response Unit Model 3 attaches toan IBM processor through the byte multiplexer
channel. Each 7770 occupies one control-unit
position and needs one byte multiplexer subchannel
for each communication line.
Telecommunication Facilities
The basic 7770 operates four half-duplex,
voice-grade communication lines, but this capacity
can be expanded in four-line additions to 48 lines.
Random inquiries on all input/output lines can be
responded to simultaneously. A common carrier
must supply all data sets.

Figure 1-1. IBM 7770 Audio Response Unit

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features , see the IBM sales
representative.

Chapter 1. Audio Communication Devices

1·1End Of Inquiry (EOI) Disable

I/O Line Panel

The end of inquiry disable feature permits an EOI
character on pushbutton telephones to be used as adata character instead of an EOI character.

An I/O line panel feature is needed for each groupof eight input/output lines or portion thereof added
beyond the first eight lines. A maximum of fivepanels is permitted.

I/O Line Expander
Each I/O line expander feature permits attachmentof four additional input/output lines. A maximumof 11 of these features is permitted.
I/O Line FrameThe I/O line frame feature supplies an additionalframe when the number of input/output lines ismore than 16.

1-2

IBM Input/Output Device Summary

Vocabulary Words, Additional
The vocabulary words, additional feature permits
increments of 16 words to be added, up to a
maximum of 128 words.

Chapter 2. Auxiliary Processors
An auxiliary processor attaches to a channel toexpand the capabilities of the host processor.

Operation• Modell has a capacity of 262,144 (256K) bytes.

The calculations are user-specified tasks in theapplication program and are processed by the 3838
concurrent with the processing of other data by thehost processor. The 3838 generates either a single
result or an array of results from its calculations.
Input data elements can be 16-bit fixed-point
halfwords, 32-bit floating-point words, or 64-bit
floating-point doublewords. Among the calculations
performed by the 3838 are: convolution, correlation,
vector and scalar multiplication, vector addition,
division, square root, format conversion, andbranching and sequencing control.

• Model 2 has a capacity of 524,288 (512K) bytes.

Attachment to Processor• Model 3 has a capacity of 1,048,576 (l ,024K)
bytes.

The 3838 is supported by OS/VS2 (MVS) and canbe attached to an IBM processor through a block
multiplexer channel.

3838 Array Processor Models 1
through 3
The 3838 Array Processor (Figure 2-1) is ahigh-speed auxiliary processor that performs
complex, repeated mathematical calculations in theanalysis of periodically tested input data for
petroleum industry applications.
The 3838 has the following bulk storage capacities:

The highlights of the 3838 follow .

Figure 2-1. IBM 3838 Array Processor

Chapter 2. Auxiliary Processors

2-1

Functional Units
The 3838 has the following functional units:• The channel interface, which supplies the link
between the array processor and the processor
through the block multiplexer channel.
• The control processor, which receives commands
from the processor over the channel interface,and schedules and controls the processing
functions in the other elements of the 3838.
• The arithmetic processor, which performs
arithmetic operations. It includes: an arithmetic
element control with writable control storage;arithmetic elements (2 four-stage adders, afour-stage multiplier, and a sine/cosine
generator); and working storage (two 8,192 byte
sections).
• Bulk storage, which supplies storage for data
buffers, coefficients, and program parameters.
The interleaving operation of the storage modules
in bulk storage reaches data rates of up to 40
megabytes per second.
• The data transfer controller, which sends dataand parameters between bulk storage and theother 3838 elements. The data transfer controller
performs logical operations on data during atransfer between bulk storage and the working
storage of the arithmetic processor.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Arithmetic Element Control Storage Additional
The arithmetic element control storage additionalfeature increases the control storage capacity by anadditional 16,384 bytes for more algorithm
capability.
Two Byte Interface
The two byte interface feature supplies a two-byteparallel transfer on the IBM 2880 BlockMultiplexer Channel to reach data transfer rates of
up to 3 megabytes.

2-2

IBM Input/Output Device Summary

3848 Cryptographic Unit Model 1
The 3848 Cryptographic Unit Model 1 (Figure 2-2)
is an a'uxiliary unit that enciphers and deciphersdata. It is designed to strengthen data processing
installation and network security by supporting theencryption and decryption of stored data files aswell as transmitted data. The major functions
performed by the 3848 are internal control, data
buffering (4,096-byte buffer), andencryption/decryption. It attaches to the virtualstorage System/370 Models 145 through 168, andthe 3031, 3032, and 3033 Processors.
The highlights of the 3848 follow.
Program Support
The 3848 enciphers and deciphers data underprogram control when operating with a System/370
selector or block multiplexer channel.
The 3848, which operates under the data encryption
standard of the U. S. National Bureau of Standards,
is controlled by the IBM Cryptographic Unit
Support Program Product running under OS/VSI
or OS/VS2 (MVS).
Personalization/Key Entry Unit
The 3848 has a hand-held personalization key entry
unit (P /KEU) and an operator control panel(Figure 2-3). The P /KEU is an accessory that isavailable on a purchase-only basis. The P /KEU,
when connected to the 3848, permits the operator toenter a unique, random-selected master key that
supports the enciphering and deciphering of data.
The key consists of two 8-byte blocks of data
entered as hexadecimal characters. Character entry
is aided by color-coded status indicator lights on theoperator panel. Battery power protects the key frombeing erased if a power failure occurs.
Operation
The 3848 works as a system input/output device.
Requests for the encryption or decryption of data
may come from either an application program, or asubsystem such as the virtual telecommunications
access method (VTAM) or the virtual storage accessmethod (VSAM). VTAM operates with remotedevices over communication lines, and VSAM
operates with data storage devices. Data is moved
from processor storage through a channel to the3848 where it is enciphered or deciphered andreturned to the processor. Enciphered or deciphereddata is then moved from the processor to its
destination.

Figure 2-2. IBM 3848 Cryptographic Unit Modell

Chapter 2. Auxiliary Processors

2-3

Ope rato r Panel
Personal izatio n/ Key Ent ry Unit (P/ KEU)

Figure 2-3. Personalization/Key Entry Unit and Operator Panel

2.4

IBM Input/Output Device SummaryChapter 3. Direct Access Storage Devices
Direct access storage devices supply the capacity forstoring large amounts of data and give direct accessto physical records. They are used for storing
programs, data bases, and other information neededfor operating a system and implementing usera pplica tions.
A variety of direct access storage devices isavailable. All use magnetic disks to store data, butthey vary in technical implementation. Thesevariations in technology result in differences in thetime needed for locating and transferring data, andin storage capacities. The devices also vary in termsof the processors to which they can be attached andthe attachment methods.
The following section describes the storage controls
and the disk storage devices. The individual
descriptions are followed by Figures 3-11 through
3-15, which compare the products by features,characteristics, capacities, and performance.
Features that are standard on most products aredescribed in summary in Figure 3-11 rather thanincluded in each individual device description.

2835 Storage Control
The 2835 Storage Control and the 2305 Fixed Head
Storage (Figure 3-1) are always used together. The
2835 supplies all the controls between the channel
and the 2305 disk storage. The 2835 also supplies
power for the disk storage. The 2835 Model 2
supports one or two 2305 Model 2 units.
The highlights of the 2835 follow.
Attachment to a Processor
The 2835 Model 2 can attach to: System/360
Models 85 and 195; System/370 Models 145, 148,
155, 158, 165, 168, 195; and to 3031, 3032, 3033,
and 4341 Processors. It attaches through a block
multiplexer channel.
Channel Commands Supported
The 2835 supports channel commands used forcount, key, and data formatted records.

Figure 3-1. IBM 2835 Storage Control and IBM 2305 Fixed Head Storage

Chapter 3. Direct Access Storage Devices

3-1

Special Features

be intermixed on a 3830 Model 2; however, if a
3344 disk storage unit is included in a 3340
Model A2 or A2F string, neither a 3330 nor a3350 disk storage unit can be attached to thesame 3830 Model 2 storage control.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Model 3 supplies the attachment of 3333/3330 and
3350 disk storage drives in a 3850 Mass Storage
System.

Two Channel Switch

Attachment to a Processor

The two channel switch feature permits the 2835
and its attached 2305 Fixed Head Storage drives tobe shared by two different channels of the same ordifferent processors. The storage control is madeavailable to a channel by Enable/Disable switcheson the operator panel or through commands.

The 3830 can attach through a block multiplexer
channel to: a System/360 Model 195; System/370
Models 135, 138, 145, 148, 155, 158, 165, 168, and195; and 3031, 3032, 3033, and 4341 Processors. It
can also attach to System/370 Models 135 and 145
selector channels.

Remote Switch Attachment
The remote switch attachment feature moves the
Enable/Disable switches of the two channel switch
feature from the 2835 operator panel to aconfiguration control panel of a System/370 Model
158MP or 168MP.

3830 Storage Control
The 3830 Storage Control supports disk storage
types that include a string controller; therefore,
different disk storage types can be supported andintermixed on the same control unit. For example,
3333/3330 Disk Storage and 3350 Disk Storage
both can attach to a 3830 Model 2, and both can
attach to the same 3830 Model 2. The 3830
supplies the control between the channel and thestring controller. It contains its own power but none
for the attached disk storage.
The 3830 has two models: Models 2 and 3. Model 2
supports the following types of disk storage:• 3333 Disk Storage Models 1 and 11 , (withcontroller) and attached 3330 Disk Storage
Models 1,2, and 11 .
• 3340 Disk Storage Models A2 or A2F (withcontroller), and attached 3340 Models Bl andB2. The larger capacity 3344 Models B2 andB2F can take the place of some of the 3340
Models B2 and B2F.
• 3350 Direct Access Storage Model A2 or A2F(with controller), or Model C2 or C2F (withalternate controller) and attached 3350
Models B2 and B2F.
• Combinations of the following: 3333; 3340 Model
A2 or A2F; and 3350 Model A2 or A2F. These
string controllers and attached disk storages can

3-2

IBM Input/Output Device Summary

Figure 3-2. IBM 3830 Storage Control

Channel Commands Supported
The 3830 Storage Control supports channel
commands used for count, key, and data formatted
records.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Control Store Extension, Expanded Control Store,
and Register Expansion

With the Model 3, attachment to the channel of asingle processor requires a two channel switch.

The control store extension, expanded control store
and register expansion features have a variety offunctions. Depending on the attached disk storage
type, one or more of these features are used to
double the number of strings of disk storage thatcan be attached, and to intermix strings of different
disk storage products. These features also support
the string switch and fixed head features on disk
storage products. The three features apply to the3830 Models 2 and 3.

Two Channel Switch, Additional

Control Store Extension: The control store
extension feature uses 32 device addresses andpermits attachment of two additional strings of3333/3330s, or two additional strings of 3340s.

The two channel switch, additional feature permits
the 3830 Model 2 and attached disk storage to beshared by four different channels, two of which may
be on the same processor.
On the 3830 Model 3, the two channel switch,
additional feature permits three channels, two of
which may be on the same processor, to have accessto the 3830.
The two channel switch feature is a prerequisite forthe two channel switch, additional feature.
Remote Switch Attachment and Remote Switch
Attachment, Additional

Control Store Extension plus Register Expansion:
The combination of the control store extension andthe register expansion features uses 64 device
addresses and permits attachment of two additional
strings of 3340s, with 3344s attached to two out offour 3340 Model As.

The remote switch attachment and remote switch
attachment, additional features move theEnable/Disable switches of the two channel switch
feature from the 3830 Model 2 or Model 3 operator
panel to a configuration control panel.

Control Store Expansion, plus Register Expansion,plus Expanded Control Store: The combination of
the control store extension, the register expansion,and the expanded control store features uses up to
64 device address (8, 16, 32 or 64) depending on theconfiguration installed. This permits attachment of
two additional strings of 3350s or any combinationof two, three, or four strings of 3333/3330s, 3340s
and 3350s.

The 3880 Storage Control (Figure 3-3) supplies thecontrol between the channel and the controller of astring of disk drives. It supplies the control between
the channel and the string controller.

Control Store Additional
The control store additional feature is available forthe 3830 Model 3 and is used in addition to theabove expansion features if the 3350 Direct Access
Storage is attached.
3350 Staging
The 3350 staging feature is available for the 3830
Model 3 and is used in addition to the above control
store additional feature. It enables the 3350 disk
storage drive to be used as staging or conventional
drives with the 3850 Mass Storage System.
Two Channel Switch
The two channel switch feature permits the 3830
Model 2 and attached disk storage to be shared by
two different channels of the same or different
processors. The storage control is made available toa channel by Enable/Disable switches on the 3830
operator panel or through commands.

3880 Storage Control

The highlights of the 3880 follow.
Storage Directors
The 3880 has two control paths, called storage
directors, which permit it to support more types of
disk storage and twice as many drives as the 3830
Storage Control.
Each storage director operates independently, withseparate control paths, data paths, and addresses.
When the two directors are attached to twochannels, the 3880 can control two data-transfer
operations simultaneously, one for each storage
director.
The types of disk storage controlled by a director
are determined from information in the 3880, which
initializes a director to control particular disk
storage types. The initialization information istransferred from diskette to 3880 storage at
installation. A director can control 3340 and 3344
disk storage devices, 3333/3330 and 3350 disk
storage devices, or 3370 disk storage devices. For
example, one director can control 3340s (and 3344s)
while the other director controls 3370s. The same
director can control both 3333 (with attached

Chapter 3. Direct Access Storage Devices

3-33330s) and 3350 disk storage units. The 3880 isdifferent from the 3830 Model 2 in that the 3340
cannot be intermixed (on the same director) with
3333 and 3350 storage units.
Channel Commands Supported
The 3880 supports both the channel commands used
for count, key, and data formatted records, and thecommands used for fixed-block formatted records.
The commands supported by a director depend on
the information in 3880 storage. For example, adirector that supports 3340s would implement thecommands used for count, key, and data records; adirector that supports 3370s would implement thecommands used for fixed-block records. Whensupporting commands for fixed-block records, the3880 translates the block numbers in the address
into the physical locations of the data on the disk.
Attachment to a Processor
The 3880 can attach, through a block multiplexer
channel, to a System/370 Models 145, 148, 155,
158, 165, and 168, and to 3031, 3032, 3033, and4341 Processors. The data-rate capabilities are 1.0,
1.5 or 2.0 megabytes per second depending on theprocessors and disk storage types to which it is
attached.

Disk Storage Attachment to the 3880
The following disk storage types and models attach
to a 3880 Storage Control:• 3333 Disk Storage Models 1 and 11 (withcontroller), and attached 3330 Models 1, 2, and11.
• 3340 Disk Storage Models A2 or A2F (withcontroller), and attached 3340 Models Bl andB2. The larger capacity 3344 Model B2 or B2F
can take the place of a 3340 Model Bl or B2.
• 3350 Direct Access Storage Model A2 or A2F(with controller), or Model C2 or C2F (alternate
controller), and attached 3350 Model Bs.
• 3370 Direct Access Storage Model A (withcontroller), and attached Model Bs (only for the4341 Processor).
Availability and Reliability
The 3880 has several advantages that help ensure
availability and reliability.
If service is needed, diagnostic information can beobtained and interpreted with the maintenancedevice (MD), used by the customer engineer. Withtwo storage directors, if one fails, error sense
information associated with the failing director canbe transferred to the system through the otherstorage director.

S peciai Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Two Channel Switch-Pair
The two channel switch-pair feature permits eachstorage director and its attached disk storage to beshared by two channels of the same or different
processors. This makes it possible for a 3880
Storage Control to be accessed by four different
channels. A storage director is made available to achannel by Enable/Disable switches on the operator
panel or through commands.
Two Channel Switch-Pair, Additional

Figure 3-3. IBM 3880 Storage Control

3-4

IBM Input/Output Device Summary

The two channel switch-pair, additional feature
permits each storage director and its attached disk
storage to be shared by four channels. This makes it
possible for a 3880 Storage Control to be accessedby eight different channels.

Remote Switch Attachment

The highlights of the 3310 follow.

The remote switch attachment feature moves the
Enable/Disable switches of the two channel
switch-pair feature from the 3880 operator panel toa configuration control panel.

2305 Fixed Head Storage
The 2305 Fixed Head Storage consists of one drivewith permanently mounted disks. All addressable
tracks have fixed read/write heads, which
completely eliminates track seek time.
The 2305 attaches to a 2835 Storage Control, which
supplies all the controls and power for the 2305 disk
storage.
The only available model of the 2305, Model 2, has
one read/write fixed head per track. It has astorage capacity of 11 .2 megabytes, an average data
locate (rotational delay) time of 5.0 milliseconds,
and a data rate of 1.5 megabytes per second. One
or two Model 2 units can attach to a 2835 Storage
Control Model 2.
Data Format
The 2305 Fixed Head Storage uses count, key, anddata formatted records and the channel commands
that support them.

3310 Direct Access Storage
The 3310 Direct Access Storage (Figure 3-4)
attaches to a 4331 Processor by way of an
integrated direct access storage device (DASD)
adapter.
The 3310 has four models:• Model Al contains a controller and one disk
storage drive.
• Model A2 contains a controller and two disk
storage drives. It provides the logic for attaching
Model B 1 or B2.
• Model B 1 contains one disk storage drive.
• Model B2 contains two disk storage drives.

Figure 3-4. IBM 3310 Direct Access Storage

Attachment of the 3310
The two Models B of the 3310 attach to the DASD
adapter through a Model A2; Model Al attaches
alone to the adapter. A string consists of a Model
A2 and Model B 1 or B2 for a total of up to four
drives. Up to four strings can attach to the DASD
adapter.
Storage Drive
The disks, spindle, and access mechanism with its
read and write heads are sealed in an enclosure andpermanently mounted on a drive. Each drive has astorage capacity of 64,520,192 bytes for a total of
approximately 258 megabytes per maximum string.
The 3310 has an average seek time of 27
milliseconds, an average rotational del~y of 9.6
milliseconds, and a data rate of 1,031,000 bytes per
second.
Data Format
The 3310 uses a fixed-block record format and thechannel commands that support it. Records areformatted in a fixed record length on the tracks, anddata is stored and transferred in 512-byte blocks.

Chapter 3. Direct Access Storage Devices

3-53333 Disk Storage and Control and3330 Disk Storage
The 3333 and 3330 Disk Storage (Figure 3-5) canbe used in a variety of configurations. The 3333
contains controller functions for a string of 3330s.
The 3333 has two models, 1 and 11 , and the 3330
has three models, 1, 2, and 11:• 3333 Modell is a string controller and contains
two drives. It provides the logic and power for
attaching up to three 3330 units. It uses IBM
3336 Disk Packs Modell.
• 3333 Model 11 is a string controller and contains
two drives. It provides the logic and power for
attaching up to three 3330 units. It uses IBM
3336 Disk Packs Model 11.
• 3330 Model 1 contains two drives and can attach
to a 3333 Model 1 or 11. It uses IBM 3336 Disk
Packs Modell .

3336 Disk Pack
IBM 3336 Disk Packs are removable from thedrives by the customer. The disk packs are mounted
in drawers that open and close automatically. The
3336 Disk Pack Model 1 has a storage capacity of
100 megabytes, and the Model 11 has a storage
capacity of 200 megabytes. The 3336 Model 1 isinterchangeable on 3330 Models 1 and 2 and 3333
Model 1 drives. It cannot be used on Model 11 ofeither the 3333 or 3330. The 3336 Model 11 isinterchangeable on the 3333/3330 Model lIs. It
cannot be used on 3330 Models 1 and 2 or 3333
Modell. The 3336 Modell can befactory-converted to a 3336 Model 11.
Attacbment of tbe 3330 and 3333
The 3333 can attach to a 3830 Storage Control
Model 2 or 3, a 3880 Storage Control, an integrated
storage control (lSC), integrated file adapter (lFA),or direct disk attachment (DDA) .
Data Format• 3330 Model 2 contains one drive and can attach
to a 3333 Model 1 or 11. It uses IBM 3336 Disk
Packs Modell .
• 3330 Model 11 contains two drives and can
attach to a 3333 Model 1 or 11 . It uses IBM
3336 Disk Packs Model 11 .
All models of the 3333 and 3330 have an average
seek time of 30 milliseconds, an average rotational
delay of 8.4 milliseconds, and a data rate of 806,000
bytes per second.
The highlights of the 3330 and 3333 follow.

3330·1Figure 3-5. IBM 3330 and 3333 Disk Storage

3·6

IBM Input/Output Device Summary

3330· 1The 3333/3330s use count, key, and data formatted
records and the channel commands that support
them. The user determines the length andarrangement of the records on the tracks.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

3333· 1

String Switch
The string switch feature permits the 3333 and its
connected 3330 disk storage to be shared by two
storage controls (or storage directors) on the sameor different processors. The 3333/3330 string is
made available to a channel by Enable/Disableswitches on the operator panel or throughcommands.
Remote Switch Attachment
The remote switch attachment feature moves the
Enable/Disable switches of the string switch featurefrom the 3333 operator panel to a configuration
control panel.

3340 and 3344 Direct Access Storage
The 3340 Direct Access Storage Facility (Figure3-6) has two different storage capacities, and the3344 Direct Access Storage (Figure 3-7) has fourtimes the capacity of the largest 3340. Both the3340 and 3344 are available with fixed heads onsome tracks for faster access to high-priority data.

Figure 3-6. IBM 3340 Direct Access Storage Facility

The 3340 has three models, A2, Bl, and B2:• Model A2 is the string controller and contains
two disk storage drives. It provides the logic andpower for attaching up to three 3340 and 3344
Model B units, which can be intermixed in astring. The total number of drives that can be
included in a string depends on the method of
attaching the Model A2 to the processor, but inall configurations, eight drives are the maximumthat can be included.
• Model Bl contains one disk storage drive.
• Model B2 contains two disk storage drives.
The 3344 has two models, B2 and B2F. Bothmodels contain two disk storage drives. Each drive
has a fixed, sealed assembly of disks, spindle, andaccess mechanism with read/write heads. Model B2
has a storage capacity of 279,558,144 bytes and an
average seek time of 25 milliseconds. In Model
B2F, 1,004,160 bytes are accessible by fixed heads
with zero seek time. The 3344 attaches in a string
to a 3340 Model A2. There are some prerequisites
and limitations on the attachment of 3344s.
All models of the 3340/3344 have an averagerotational delay time of 10.1 milliseconds and a data
rate of 885,000 bytes per second.

Figure 3-7. IBM 3344 Direct Access Storage

The highlights of the 3340 and 3344 follow.
3348 Disk Pack
The 3340 uses IBM 3348 Data Modules (Figure3-8). The 3348 is a sealed assembly that contains
the disks, spindle, and access arms with read/write
heads. It is removable from the drive by thecustomer and is available in two capacities: Model
35 with a 34,944,768-byte capacity and Model 70
with a 69,889,536-byte capacity. With both models,the average seek time is 25 milliseconds. Model 70F
has the same total capacity as the Model 70 but
with 502,080 bytes of storage accessible by fixed
heads with zero seek time. Models 35 and 70 are

Chapter 3. Direct Access Storage Devices

3-7interchangeable on all drives, but use of the Model
70F needs the fixed head feature on the 3340.

Remote Switch Attachment
The remote switch attachment feature moves the
Enable/Disable switches of the string switch featurefrom the 3340 operator panel to a configuration
control panel.

3350 Direct Access Storage,

Figure 3-8. IBM 3348 Data Module

Attachment of the 3340 and 3344
The 3340 Model A2 attaches to the following
storage controls: 3830 Storage Control Model 2,3880 Storage Control, Integrated File Adapter(IFA), Integrated Storage Control (lSC), Direct
Disk Attachment (DDA), or Direct Access Storage
Device (DASD) Adapter. The 3344 cannot be
included in a DASD Adapter for attachment to the4331 Processor.
Data Format
The 3340 and 3344 use count, key, and data
formatted records and the channel commands that
support them. The user determines the length andarrangement of the records on the tracks.

Special Features for the 3340
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Fixed HeadThe fixed head feature permits Models A2, Bl, andB2 to operate the 3348 Model 70F.
Rotational Position Sensing
The rotational position sensing feature permits thechannel to disconnect during most of rotational
delay time. It is standard on the 3344.
String Switch"

The string switch feature permits the 3340 Model
A2 and its connected 3340 and 3344 disk storage tobe shared by two storage controls on the same ordifferent processors. The 3340 is made available toa channel by Enable/Disable switches on theoperator panel or through commands.

3·8

IBM Input/Output Device Summary

The 3350 Direct Access Storage (Figure 3-9) is ahigh-speed, large-capacity, disk storage device forattachment to any virtual storage System/370
Processor (except Models 115 and 125) or to a 4341
Processor.
The 3350 has six models: A2, A2F, B2, B2F, C2,
and C2F.
All models contain two drives with fixed, sealed
assemblies of disks, spindles, and access mechanisms
with read/write heads. Each drive has a storage
capacity of 317.5 megabytes.
The characteristics of the six models are:
• Model ·A2 is a string controller and contains two
disk storage drives. It provides power and logic toattach up to three units of Models B2 and B2F.
One unit of Model C2 or C2F can be used inplace of a Model B2 or B2F.
• Model A2F is the same as Model A2 except it
has fixed heads on each drive for access to
1,144,140 bytes of the 317.5 megabyte storage.
• Model B2 contains two drives and attaches to a
Model A2 or A2F.
• Model B2F is the same as the Model B2 except it
has fixed heads on each drive for access to
1,144,140 bytes of the 317.5 mega byte storage.
• Model C2 contains two drives and supplies
alternate controller functions in a 3350 string. It
functions as a Model A or Model B depending on
a manual switch setting. If a Model C2 isincluded in a string, a primary controller adapter
feature is needed on the Model A2 to which theModel C2 attaches.
• Model C2F is the same as Model C2 except it
has fixed heads on each drive for access to
1,144,140 bytes of the 317.5 megabyte storage.
The average seek time with movable heads is 25
milliseconds, the average rotational delay is 8.4
milliseconds, and the data rate is 1,198,000 bytes
per second.
The highlights of the 3350 follow .

3350 Controller

Special Features

The 3350 Direct Access Storage can include twocontrollers in a string of units. Besides the primarycontroller unit, an alternate controller unit, Model
C2 or C2F, can be added. A manual switch on theC2 or C2F unit selects the controller that controls
online operations. If the active controller needs
service, the other controller can continue operations,but when control is switched, status information is
not preserved.
Modes of Operation
The 3350 operates in different modes. It functions
in a real (3350) mode or in modes that arecompatible with the IBM 3330 Disk Storage Models
I and II. The mode of operation, real (3350) or
3330-compatible, can be specified for each drive atmanufacture and can be changed in the field by acustomer engineer. When the 3350 operates incompatibility mode, the storage capacity is 200
megabytes per drive. On Models A2F, B2F, andC2F the fixed heads have access to 742,710 bytes ofdata.
Attachment of the 3350
The 3350 Model A2 attaches to the following
storage controls: 3830 Storage Control Models 2
and 3, 3880 Storage Control (3350 real mode only);and Integrated Storage Control (ISC).
Data Format
The 3350 use count, key and data formatted records
and the channel commands that support them. The
user determines the length and arrangement of therecords on the tracks.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Primary Controller Adapter
The primary controller adapter feature permits useof the alternate controller when it is selected
through a switch on the alternate controller.
String Switch
The string switch feature permits a 3350 Model A2
or A2F and C2 or C2F and connected disk storage
to be shared by two storage controls. The 3350 ismade available to a channel by Enable/Disableswitches on the operator panel or throughcommands.
Remote Switch Attachment
The remote switch attachment feature moves the
Enable/Disable switches of the string switch featurefrom the 3350 operator panel to a configuration
control panel of a System/370 Model 158MP or
168MP.

3370 Direct Access Storage
The 3370 Direct Access Storage is a high-speed,
fixed-media, disk storage for attachment to a 4331
or 4341 Processor.

3350 Model C2 or C2F
3350 Model B2 or B2F
3350 Model A2 or A2F

Figure 3-9. IBM 3350 Direct Access Storage
Chapter 3. Direct Access Storage Devices

3-9The 3370 has two models, Al and Bl:

Attachment of the 3370

• Model Al is a string controller and contains one
drive with two access mechanisms. It supplies thelogic for attachment of up to three Model B1
units.

The 3370 Model Al attaches to a 3880 Storage
Control, which attaches to a 4341 Processor, and toa Direct Access Storage Device (DASD) adapter,
for attachment to a 4331 Processor. The 3370 also
can be attached by an integrated adapter to a
System/38; however, the units have different model
designations, Models All and Bll.

• Model Bl contains one drive with two accessmechanisms.
The 3370 has an average seek time of 20
milliseconds, an average rotational delay of 10.1
milliseconds, and a data rate of 1,859 kilobytes per
second.
The highlights of the 3370 follow.
Access Operation

Data Format
The 3370 uses a fixed-block record format and thecommands that support it. Records are formatted ina fixed record length on the tracks, and data isstored and transferred in 512-byte blocks.
Seniceability

The 3370 Direct Access Storage (Figure 3-10)
overlaps operations by having two accessmechanisms for each drive. Each access mechanism
is separately addressable and can access 285.6
megabytes of data. One access mechanism services
one-half of the disks on the drive and the otherservices the other half. While one access mechanism
is seeking or transferring data, the other can beseeking data on the same drive.
The disks, spindle, and access mechanism withread/write heads are permanently mounted on thedrive.

If service is needed on the 3370, diagnostic

information can be obtained and interpreted with amaintenance device (MD) used by the customer
engineer.

Special Features
The following feature can be ordered through the
IBM sales representative to expand or customize theuser's operation. For more information about thisfeature, see the IBM sales representative.
String Switch
The string switch feature permits the 3370 ModelA 1 and its connected disk storage to be shared by
two storage controls. These controls may be either
3880s or DASD adapters.

Figure 3-10. mM 3370 Direct Access Storage
3-10

IBM Input/Output Device Summary

Data Comparison Tables
Figures 3-11 through 3-12 give comparisons of data
for the storage controls and disk storages mentioned
in this chapter.

Disk Storage

Storage Controls
Features·

Notes

2835

Command

I

-

3830

3880

Supported Supported

2305

3310

3330

3333

3340

3344

3350

3370

-

Standard

Standard

Standard--

Standard

Standard

Retr~

Rotational
Position
Sensing2

Supported Supported Supported

Standard

Standard

Standard

Standard

SpecialStandard

Standard

Standard

MultipleRequesting3

Supported Supported Supported

Standard-

Standard

Standard

Standard

Standard

Standard-

RecordOverflow4

Supported Supported Supported

Standard.-

Standard

Standard

Standard

Standard

Standard-

End of File

5-

Multiple
Track
Operations

6

-

Write
FormatRelease7--

Primary
Controller
Adapter8-StringSwitch9

TwoChannelSwitch---Standard

Standard

Standard

Standard

Standard-

Standard-

Standard

Standard

Standard

Standard

Standard

-

-

-

-

Standard
for ModelStandard
for Model--Standard

-

11

11

-

-

-

-

-

-

-

-

Special--SpecialSupport

-

-

-

-

SpecialSpecial-SpecialSpecial10

SpecialSpecialSpecial(Pair)---

SpecialSpecial-Special-Two
ChannelSwitch,Additional

10-

SpecialSpecial(Pair)

-

-

-

-

-

-

-

-

RemoteSwitch (ForStringSwitch)11

SpecialSpecialSpecial

-

-

-

-

-

-

-

-

RemoteSwitch,Additional

11-

Special

-

-

-

-

-

-

-

-

-

Fixed Head

12

-

-

-

Standard---

SpecialStandard(ModelB2F only)

Standard(Models
A2F,
B2F, andC2F only)--

Supported Supported·Standard features are part of the basic machine; special features can be ordered. For possible limitations, consult your IBM sales representative.
Notes:

1. Command retry is a storage control and channel procedure that permits a command to be sent again without interrupting the program. It serves animportant role as a means of correcting data errors without involving system recovery procedures. It also is used to send again commands in othersituations.
2. Rotational position sensing permits the channel to send a command to find a record and then disconnect while the disk rotates to the record's location.
It is implemented in the storage control and is based on the division of the tracks into sectors that can be sensed during disk rotation.
3. Multiple requesting permits the storage control to execute multiple channel programs conncurrently for its attached devices by queuing commands.
Rotational position sensing at the disks and block mUltiplexing in the channel make multiple requests possible.
4. Record overflow permits a record to extend to another track to give a means of processing logical records that exceed the capacity of the track. It
applies to count, key, and data records.
5. End of file permits defining the end of a logical grou~ of records. It applies to count, key, and data records.
6. Multiple track permits the storage control to select t e next seqentially numbered head without sending Seek Head commands. It applies to count,key, and data records.
7. Writ%Ormat release, or write padding, frees the subsystem and erases to the end of the track after a write format command. It applies to count, key,
and ata records.
8. Primary controller adapter permits use of the alternate controller when selected through a switch on the alternate controller.
9. String switches permit disk storage units in a string to be accessed and shared by different storage controls on the same or different channels.
10. Channel switches permit a storage control to be accessed and shared by different channels on the same or different processors.
11. Remote switches move the channel and string switch controls to a remote panel.
12. Fixed head feature eliminates track access time for some or all of the addressable locations.

Figure 3-11. Comparison of Features for Storage Controls and Disk Storage
Chapter 3. Direct Access Storage Devices

3-11

Storage Controls

2835

Characteristics
Commands Su~rted

3830

3880

Count, Key, Data

Count, Key, Data; Fixed Block

Strings Attachable (Standard)-

TwoEight; Four for Each Storage
Director

Strings Attachable (Special)-

Special Extension Features for
Two Additional Strings

Count, Key, Data

2305 Model 2

Attaches-• 3333 Models I, 113330 Models 1,2, 11• 3340 Models A2, A2F, Bl,
B2,B2F
3344 Models B2, B2F• 3350 Models A2, A2F, B2,
B2F, C2, C2F• 3333 Models I, 113330 Models I, 2, 11• 3340 Models A2, A2F, Bl,
B2,B2F
3344 Models B2, B2F• 3350 Models A2, A2F, B2,
B2F, C2, C2F• 3370 AI, Bl

Figure 3-12. Comparison of Characteristics for Storage Controls
Disk Storage
Characteristics

2305

3310

3330

3333

3340

3344

3350

3370

Data Format

Count, Key, Fixed Block Count, Key, Count, Key, Count, Key, Count, Key, Count, Key, Fixed
Data
Data
Data
Data
Data
Data
Block

Storage

Fixed Disks Fixed
SealedAssembly

Fixed Heads

All Tracks

Access Mechanisms Per
Drive

None

One

One

Drives Per Unit (ByModel)

2-0ne

AI-OneA2-TwoBI-OneB2-TwoI-Two
2-0ne
ll-TwoUnits Per String(Maximum)Two

One 3310
One 3333 + One 3333 +Model A2
Three
Three
+ One 3310 3330s
3330s
Model B2

Attaches to2835
Model 2DASD
Adapter(4331)

Note: The number ofstrings that can be
attached depends on theattachment method, theprocessor, and, in somecases, special extension
features.

Fixed
SealedAssembly

Fixed
SealedAssembly

Some
Some
Tracks on
Tracks on
3348 Model Model B2F
70F(Requires
SpecialFeature)Some
Tracks on
Models
A2F, B2F,
and C2F

-

One

One

One

One

Two

I-Two
II-TwoA2-TwoBI-OneB2-TwoBI-0neB2-TwoA2-TwoA2F-Two
B2-TwoB2F-TwoC2-TwoC2F-Two

AI-OneBI-OneOne 3340
Model A +Three 3340
Model Bsor 3344
Model Bs

One 3340
One 3350
Model A + Model A +Three 3344 Three 3350
Model Bs
Model Bs
or Two3350 ModelBs and One
3350
Model C

Removable
Disk Pack

Removable
Disk Pack---

Removable
SealedModule3333 Model 3830 Model
1, 11
2*,3830
Model 3,3880,ISC(145, 148,
158, 168),
IFA (135,138), DDA
(125)

*Numbers within parentheses are models of the System/370 or processor numbers.

Figure 3-13. Comparison of Characteristics for Disk Storage

3-12

IBM Input/Output Device Summary

Fixed
SealedAssembly

3830 Model 3340
2*, 3880,
Model A2
ISC (145,
148, 15S,
168),IFA(135, 138),
DDA (115,
125),
DASD
Adapter(4331)

3830 Model
2*,3830
Model 3,3880,ISC(145, 148,
158, 168)

One 3370
Model A +Three 3370
Model Bs

3880*,DASD
Adapter(4331,
System/38)

Megabytes Per String(Maximum)Megabytes Per AccessMechanism

Megabytes Per Drive

Megabytes Per Unit

2305 Model 2

-

11.2

11.2

22.4 (2 Drives)

3310

64

64

128

256 (4 Drives)

3333/3330
3336 Modell
3336 Model 11

100
200

100
200

200
400

800 (8 Drives)
1,600 (8 Drives)

35
70

35
70

70
140

280 (8 Drives)
560 18 Drive~

3344

280

280

560

1,820 (2 Drives 3340
Model A, 6 Drives 3344)

3350

317

317

635

2,540 (8 Drives)

3370

285

571

571

2,284 (4 Drives)

Disk Storage

3340
3348 Model 353348 Model 70

Figure 3-14. Comparison of Capacities for Disk Storage

Access-Motion (Seek)
Time, Average
Milliseconds(See Note 1)

Rotational Delay Time,
Average Milliseconds(See Note 2)

Data Rate Kilobytes Per
Second(See Note 3)2305
Model 2

0

5.0

1,500

3310

27

9.6

1,031

Disk
Storage

3333/3330

30

8.4

806

3340

25·

10.1

885

3344

25·

10.1

885

3350

25·

8.4

1,198

3370

20

10.1

1,859

·Times with movable heads. Some models have fixed heads at some tracks.
Notes:
1. Access motion time, or seek time, is the time needed to position the access mechanism at
the track (cylinder). If the mechanism is already at the correct track (cylinder) or if fixed
heads are used, there is no access motion.

2. Rotational delay time is the average time needed for the specified record to turn to theread/write head so that the data transfer can begin.
3. Data rate is the instantaneous speed at which bytes are transferred.

Figure 3-15. Comparison of Performance for Disk Storages

Chapter 3. Direct Access Storage Devices

3-13Chapter 4. Diskette Input/Output Devices
The diskette input/output devices read and write
data on the IBM diskette, which permits an IBM
processor to have access to the data through thediskette.

3540 Diskette Input/Output Unit
Models Bl and B2
The 3540 Diskette Input/Output Unit (Figure 4-1)
is an efficient and economical data input/output
device. There is no contention for devices between
data entry and processing programs.
The 3540 has two models:• Model B 1 has one diskette drive.
• Model B2 has two diskette drives, which operate
independently from each other. Each drive has aseparate hopper and a separate stacker that canhold up to 20 diskettes.

The highlights of the 3540 follow.
Attachment to a Processor
The 3540 needs a control unit position on a systemchannel. The 3540 attaches to a byte multiplexer
channel, block multiplexer channel, or selector
channel.
IBM Diskette
The 3540 reads and writes on the IBM diskette,
which is the same diskette used by the 3740 Data
Entry System. The 3540 reads up to 3600 disketterecords per minute and writes up to 2200 records
per minute.
Automatic Feed
Under program control, diskettes are automaticallyfed, one at a time, from the hopper and mounted on
the drive spindle for a read or write operation. At
the end of the operation, the diskette is
automatically removed from the spindle and stacked,
which permits uninterrupted processing. Diskettes
are loaded and removed by the program while thedevice is operating.
Data Integrity
Data integrity is ensured because each diskette goes
through label checking before the data is read.
Data Entry From 3740
The 3540, because it uses the IBM diskette, also
supplies a way for entering data recorded by the3740 directly into an IBM processor.

Figure 4-1. IBM 3540 Diskette Input/Output Unit
Model B2

Chapter 4. Diskette Input/Output Devices

4-1Chapter 5. Display Devices
The display devices supply high-speed visualcommunication between an IBM processor and its
user. Tables, graphs, charts, and alphameric data
are displayed on a cathode-ray tube. Keyboards anda light pen (Figure 5-1) supply the way for enteringand changing processor information.

3251 Display Station Modell
The 3251 Display Statiori (Figure 5-1) is aninteractive computer graphics display station for the
display of graphic and alphameric data generated byan IBM processor. The display station has
attachm~nts for operator interaction with thedisplayed picture, which permits considerable
interactive operator-machine communications.
The 3251 is a free-standing, table-top display, foreasy incorporation into a user's office environment.
Its keyboards special features are separate andmovable, for operator convenience.
The highlights of the 3251 follow.
,

can be expressed in absolute form or
incrementally, relative to the current beam
position.
• Graphical data that can be displayed as a seriesof points (point plot orders), or in one of four line
types: solid, dotted, dashed, or dot-dashed (vector
plot orders).
• A high-quality character set that comprises both
uppercase and lowercase, which can be displayed
either horizontally or vertically (90 degrees
counterclockwise) in any of four sizes.
• A vector-draw speed of 8890 m (350,000 in.) per
second, that is, 34 microseconds for 305 mm (12in.) screen deflection.
• A vector-move speed of 22 microseconds for 305
mm (12 in.) screen deflection.
• A character-draw average speed of 4.2
microseconds for a BASIC size character (height
4.1 mm [0.16 in.]).

'Configuration of the 3251 Attachment to a Control
Unit
Together with the 3255 Display Control and the3258 Control Unit, the 3251 forms part of the 3250
Graphics Display System and can be used in
multiple display station configurations forcomputer-aided design, computer-aided
manufacturing, and scientific analysis applications.
It is particularly suited to those applications thatneed considerable interaction and the display of
pictures that contain a high-vector and character
content.
Up to two 3251s can be attached to each 3255; thefirst 3251 must be next to the 3255; the second
3251 can be located up to 15.2 m (50 ft) from the3255. Up to four 3255s can be attached to eachchannel-attached 3258; each 3255 can be located up
to 1525 m (5,000 ft) from the 3258.
CRT Display Characteristics
The characteristics of the CRT display are:• A 534 mm (21 in.) diagonal, directed beam,display unit that has a 305 by 305 mm (12 by 12in.) viewing area.
• Vector graphics-straight lines that can bedisplayed between any of the 1024 by 1024
addressable positions on the screen. Throughdisplay buffer orders, vector endpoint coordinates• Eight programmable intensities (including blank)for points, vectors, or characters; the threebrightest ievels can be sensed by the light pen.
• Audible and visible (blink) alerts that can be
programmed to notify the display station operatorof exceptional conditions.
• Displayable data-the amount of data displayabledepends on many factors, including the mix ofvectors and characters. With one 3251 attached
to a 3255, then at 40 cycles per second
regeneration rate, at least the following can bedisplayed:- Either 9500 incremental vectors of
9.5 mm (0.375 in.),- or 2150 absolute vectors of 76 mm (3 in.),- or 5250 BASIC size characters (averagemix).
With two 3251s attached to a 3255, theperformance is slightly less than half that shown
above.
• Regeneration of display image-when the 3251
displays images at a regeneration rate of 40
cycles per second, the picture quality is superior
to that of images displayed by the 2250 Display
Unit Model 3 at 40 cycles per second. As the
picture content is reduced, the regeneration rateincreases up to a maximum of 46 cycles per
second.

Chapter 5. Display Devices

5-1Program Support
Software support is through Graphic Programming
Services (GPS), which includes the Graphic Access
Method (GAM), and the Graphic Subroutine
Package (GSP) . These are system control programs
running under OS/VS1 and OS/VS2 operating
systems.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Alphanumeric Keyboard
The alphanumeric keyboard feature supplies a
typewriter-like layout for entering data and controls.
The keyboard for US English, UK English, French,
German, and Italian character sets has 75 keys with
two shifts, and has uppercase and lowercase
alphabets, numbers, symbols, and control functions.
The Katakana character set needs a 76-key
four-shift keyboard and has alphameric data,
symbols, control functions, and Katakana characters.
Input is aided through a visible cursor on the screen
and display buffer orders that specify fields which
the operator can or cannot use for input.
Program Function Keyboard
The program function keyboard feature supplies 32
backlit keys for operator interaction with an IBM
processor program. When a key is pressed a uniquecode is transferred to the processor; the processor
program communicates with the operator by making
inactive one or more backlit keys. The keyboard is
at an angle for operator convenience.
Light Pen
The light pen feature supplies a hand-held, pen-likedevice for interaction with the displayed image.
When the light pen is pointed at a component of thedisplayed image, it permits sensing and, underprogram control, selection of that component. A tip
switch on the pen permits the selection to be
indicated to the processor program, also underprogram control.

Figure 5-1. IBM 3251 Display Station

3277 Display Station Models 1 and 2with 3272 Control Unit Models 1 and
2 or 3274 Control Unit Models lA,
1B, and 1D
The 3277 Display Station (Figure 5-2) is ahigh-performance cathode-ray tube (CRT) station
for displaying alphameric data, and for entering
data into and retrieving data from a processor
through a 3272 or 3274 Control Unit. The 3277
permits an operator to use the keyboard and selector
light pen to display and manipulate data on the
CRT screen.
The 3277 Display Station is considered to be a unitof the 3270 Information Display System, although it
can attach to other systems, such as the 3790
Communications System and 8100 Information
System, with the appropriate adapter.
The character set of the 3277 includes 36
alphameric and 27 special characters. A choice ofkeyboards, a selector light pen, and a set of program
function keys supply input flexibility.
The 3277 is available in two models:• Modell displays up to 480 characters in 12 lines
of up to 40 characters per line, and needs a 3272
Control Unit Modell or 2, or a 3274 Control
Unit with a Type B adapter to attach to a control
unit position on a system channel.

5-2

IBM Input/Output Device Summary• Model 2 displays up to 1,920 characters in 24
lines of up to 80 characters per line and needs a
3272 Control Unit Model 2, or a 3274 Control
Unit with a Type B adapter to attach to a control
unit position on a system channel.
Fields Specified by the Program
Individual fields of data on the screen of the 3277
can be program-specified for protected or
unprotected storage, alphameric or numeric display,
nondisplay, and normal or brightened character
intensity. The program can also permit or preventthe sensing of the selector light pen.

Keyboards
There are 10 keyboards to choose from. The
keyboards have 66 or 78 keys for alphameric,control, or program selection. There are two
EBCDIC typewriter keyboards, two EBCDIC data
entry keyboards, one operator console keyboard, two
ASCII typewriter keyboards, two EBCDIC
typewriter / APL keyboards, and one EBCDIC fastcursor text keyboard.
Keyboard Numeric Lock
The keyboard numeric lock feature supplies a meansof alerting the keyboard operator to certain keying
errors. When the cursor is positioned within anumeric input field and the keyboard numeric lockfeature has been installed, the keyboard iselectrically locked if any key is pressed other than
the numerals 0 through 9, minus (-), decimal sign,or duplicate (DUP).
Operator Identification Card Reader
The operator identification card reader feature gives
the ability to enter magnetically coded data from a
53 .9 by 85.7 mm (2-1/8 by 3-3/8 in.) plastic
data-processing card with an encoded magnetic
stripe. Badges and ID cards are examples of theuses of plastic data-processing cards.
Security Keylock

Figure 5-2. IBM 3277 Display Station

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Audible Alarm
The audible alarm feature supplies an alarm thatsounds when a character is entered in thenext-to-last position on the display screen. The
alarm can also be activated, under program control,
to alert the operator to a special condition.
Data Analysis-APL feature (3277 Model 2)
The data analysis-APL feature supplies aninteractive APL or text capability.

The security keylock feature prevents modificationand display of data in the display terminal unlessthe key is in the ON position.
Selector Light Pen
The selector light pen feature supplies a hand-held,
pen-like device for interaction with the displayed
image. When the light pen is pointed at acomponent of the displayed image, it permits sensing
and, under program control, selection of thatcomponent. A tip switch on the pen permits theselection to be indicated to the processor program,also under program control.

3278 Display Station Models 1
through 5 with 3274 Control Unit
Models lA, 1B, and 1D
The 3278 Display Station (Figure 5-3) has acathode-ray tube (CRT) for displaying data, and a
keyboard for entering data into and retrieving datafrom a processor through a 3274 Control Unit. The
3278 handles alphameric and graphic data. It
permits the operator to use the keyboard andselector light pen to display and manipulate data on

Chapter 5. Display Devices

5-3the display screen. The 3278 Display Station isconsidered to be a unit of the 3270 Information
Display System.
The 3278 Display Station is available in five models
and can display up to 3564 characters on the screen:• Model 1 displays 960 characters (12 lines of 80
characters) .
• Model 2 displays 1920 characters (24 lines of 80
c4aracters) .
• Model 3 displays 2560 character (32 lines of 80
characters) .
• Model 4 displays 3440 characters (43 lines of 80
characters) .
• Models 5 displays 3564 characters (27 lines of
132 characters) .
When operating in 3277-compatible data format,
the 3278 Model 1 displays 480 characters (40characters per line), and Models 2, 3, 4, and 5
display 1920 characters (80 characters per line).
A choice of keyboards, a selector light pen, amagnetic slot reader, a magnetic hand scanner, andprogram function keys give input flexibility.
Fields Specified by the Program
Individual fields of data on the screen can be
program-specified for protected or unprotectedstorage, alphameric or numeric display, nondisplay,and normal or brightened character intensity. The
program can also permit or prevent the sensing of
the selector light pen.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
APL/Text
The APL/text feature, with its prerequisite
extended character set adapter feature, enables the3278 to display (with modified user application
programs) the 222-character APL/text character
set, including the 94-character EBCDIC set.
Audible Alarm
The audible alarm feature supplies an alarm thatsounds when a character is entered in thenext-to-last position on the display screen. The
alarm can also be activated, under program control,
to alert the operator to a special condition.
Extended Character Set Adapter
The extended character set adapter feature supplies
the additional control and buffering necessary tohave access to the APL/text feature.
Extended Highlighting
The extended highlighting feature (underscore,
blink, or reverse video) is available when the 3278 is
attached to a 3274 Control Unit Model lA or ID.
Keyboard Numeric Lock
The keyboard numeric lock feature supplies a meansof alerting the keyboard operator to certain keying
errors. When the cursor is positioned within anumeric input field and the keyboard numeric lockfeature has been installed, the keyboard iselectrically locked if any key is pressed other than
the numerals 0 through 9, minus (-), decimal sign,or duplicate (DUP) .
Magnetic Reader Control
The magnetic reader control feature permits theattachment of a magnetic slot reader or a magnetic
hand scanner.
Programmed Symbols (PS)

Figure 5-3. IBM 3278 Display Station

5-4

IBM Input/Output Device Summary

The programmed symbols feature permits thecustomer to specify, store, have access to, anddisplay symbols and special characters. It also
supplies graphic capability.

Security Keylock

Attachment of the 3279 with Base-Color Mode

The security keylock feature supplies a lock and key
control over the display station and all attacheddevices, such as the selector light pen, keyboard, andmagnetic slot reader.

The different models of the 3279 with color-basemode can be attached as follows:

Selector Light Pen
The selector light pen feature is a hand-held,
light-sensitive pen that enables the operator tointeract directly with the display image by selecting
fields of data for input to the host system.
Switch Control Unit

• All models of the 3279 can be attached to the3274 Control Unit Models lA and ID.
• Models 2A and 2B of the 3279 can be attached
to any model of the 3276 Control Unit Display
Station*, except Model 1.
• Models 3A and 3B of the 3279 can be attached
to any model of the 3276 Control Unit Display
Station*, except Models 1 and 2.

The switch control unit feature permits changing
operational control of the display station between
two different control units.

Attachment of the 3279 with Extended-Color Mode

3279 Color Display Station Models
2A, 2D, 3A, and 3DSpecial Features

The 3279 Color Display Station (Figure 5-4), atable-top display that uses a high-resolution color
cathode-ray tube (CRT), is a member of the 3270
Information Display System. It can be used inclusters with the 3274 Control Unit or the 3276
Control Unit Display Station*, and in combination
with 3278 Display Stations and 3287 and 3289
Printers. When connected to the 3274 Control Unit,
the 3279 can also be used in combination with the3277 Display Stations and the 3284, 3286, and 3288
Printers.
The 3279 is available in four models:• Model 2A offers base-color mode only with ascreen capacity of 1920 characters in 24 lines of
80 characters.
• Model 2B offers both base-color andextended-color modes, extended highlighting, andAPL/text capability with a screen capacity of1920 characters in 24 lines of 80 characters.
• Model 3A offers base-color mode only with ascreen capacity of 2560 characters in 32 lines of
80 characters.

Models 2B and 3B of the 3279 can be attached only
to the 3274 Control Unit Models lA and ID.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Keyboard Numeric Lock
The keyboard numeric lock feature supplies a meansof alerting the keyboard operator to certain keying
errors. When the cursor is positioned within anumeric input field and the keyboard numeric lockfeature has been installed, the keyboard iselectrically locked if any key is pressed other than
the numerals 0 through 9, minus (-), decimal sign,or duplicate (DUP).
Magnetic Reader Control
The magnetic reader control feature permits theattachment of a magnetic slot reader or a magnetic
hand scanner.
Programmed Symbols (PS)• Model 3B offers both base-color andextended-color modes, extended highlighting, andAPL/text capability with a screen capacity of
2560 characters in 32 lines of 80 characters.

The programmed symbols feature permits storage ofand access to either two or six sets of 190 symbols,
which can be specified by the user to meetrequirements for technical symbols, foreign language
letters, or sets of graphic elements for pictorial
display.

The highlights of the 3279 follow.

Security Keylock
The security keylock feature prevents modificationand display of data in the display terminal unlessthe key is in the ON position.

* See IBM Data Communication Device Summary for more
information on the 3276.
Chapter 5. Display Devices

5-5Selector Light Pen
The selector light pen feature is a hand-held,
light-sensitive pen that enables the operator tointeract directly with the display image by selecting
fields of data for input to the host system.

device. For additional information on customer
setup devices, see the IBM sales representative.
The 8775 is available in four models:• Models 1 and 11 offer a screen capacity of 960,
1920, or 2560 display characters in a 9 by 16
dot-character matrix.
• Models 2 and 12 offer a screen capacity of 960,
1920, or 2560 display characters in a 9 by 16
character matrix, and 3440 characters in a 9 by
12 dot-character matrix.
Attachment to a Processor
Models 1 and 2 of the 8775 attach to an 8100
Information System either locally through a directly
attached loop, or remotely through a data-link
attached loop using synchronous data link control(SDLC) protocol.

Figure 5-4. IBM 3279 Color Display Station

Switch Control Unit
The switch control unit feature permits changing
operational control of the display station between
two different control units.

Programming Support
The existing host application programs that support
the 3278 Display Station attached to a 3274 Control
Unit or a 3276 Control Unit Display Station,
support the 3279 Color Display Station operating in
the monochrome and base-color modes. Optimum
use of colors in the base-color mode may needchanges to the customer-written programs.

Models 11 and 12 of the 8775 attach to an 8100
Information System over data-link communication
features. The logical structure formats, protocols,and operational sequences used for transmitting data
between an 8775 and an 8100 Information System
are specified by the System Network Architecture(SNA).
The data rate of a loop cannot be higher than thatof the slowest device on the loop. It may bedesirable to attach slower devices to a separate loop
when the 8775 must be operated at its maximum
data rate. The 8775 can operate on a 34,8000
bits-per-second loop.

Functions and features such as extended
highlighting, extended color, and programmed
symbols available on the 3279 Models 2B and 3B,need extensions to the 3270 data stream, and thedisplays must be attached to a 3274 with theappropriate features.
For more detailed information about the 3279 andprogramming support, see IBM 3270 Information
Display System: Color and Programmed Symbols.

8775 Display Terminal
Models 1, 2, 11, and 12
The 8775 Display Terminal (Figure 5-5) consists ofa display unit, its attached keyboard, and as special
features, a selector light pen and magnetic slot
reader. The 8775 is designated as a customer setup

5-6

IBM Input/Output Device Summary

Figure 5-5. IBM 8775 Display Terminal

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

the Cursor Select key instead of using the selector
light pen.

Audible Alarm
The audible alarm feature supplies a shortvariable-amplitude tone alarm when a character isentered in the next-to-last position of the partition
under keyboard operation. The alarm can also be
activated, under program control, to alert theoperator to a special condition.

The keyboard numeric lock feature supplies a meansof alerting the keyboard operator to certain keying
errors. When the cursor is positioned within anumeric input field and the keyboard numeric lockfeature has been installed, the keyboard iselectrically locked if any key is pressed other than
the numerals 0 through 9, minus (-), decimal sign,or duplicate (DUP).

Enhanced Function Feature

Magnetic Reader Control

The enhanced function feature controls the action of
the operator and assists as follows:

The magnetic reader control feature permits theattachment of a magnetic slot reader that reads
encoded information from a magnetic stripe. The
magnetic slot reader is available as a part number
from the IBM sales representative or can be orderedby feature code for a new terminal.

Highlighting: This function highlights data on a
per-character basis in one of three user-selectablemodes (blink, reverse video, or underscore), andadditionally on a field basis for intensity.
Multiple Partitions: This function displays data in
up to eight user-defined rectangular areas, each areafunctioning as a separate display. Also, the operator
can continue to enter data in one partition while theapplication program processes data in or writes toanother partition.
Field Validation: This function permits theapplication program to identify data fields as:• Mandatory Enter-fields that must be completed
before the ENTER key is pressed.
• Mandatory Fill-fields that must be completed
before the cursor can be moved to another field.
• Trigger Field-automatic data transfer to theprocessor. The function is triggered by theoperator's attempt to move the cursor from thedesignated field.
Keyboard
The keyboard features give a choice of 75- and
87-key typewriter keyboards, two types of data entry
keyboards, APL and overlay keyboards, andJapanese English and Japanese Katakana keyboards.
Each keyboard is movable and each has editing
features such as: repeat-action, cursor move, tab,back tab, protect data, insert, delete, extended erase(erase to end of field, erase all keyboard input data,and erase entire screen), and cursor select.
All alphameric, special symbol, and cursor movekeys have repeat-action capability. Fields of data
can be sensed by positioning the cursor and pressing

Keyboard Numeric Lock

Monocase Switch
The monocase switch feature permits the choice of
displaying either uppercase characters only or both
uppercase and lowercase characters.
Multiple Partitions and Scrolling
The multiple partitions and scrolling feature gives
the ability to divide the screen in up to eightuser-defined rectangular data areas. Vertical
scrolling within a specified partition is achieved
without intervention by the host system.
Line-by-line scrolling is controlled from the
keyboard using the scroll-up and scroll-down keys.
Note: The multiple partitions and scrolling featureand the enhanced function feature may be present
on the same terminal, but the user can only selectthe functions of one and not of both features at any
one time.
Programmed Symbols (PS)The programmed symbols feature permits storage ofand access to either two or six sets of 190 symbols,
which can be specified by the user to meetrequirements for technical symbols, foreign language
letters, or sets of graphic elements for pictorial
display.
Security Keylock
The security keylock feature prevents modificationand display of data in the display terminal unlessthe key is in the ON position.

Chapter 5. Display Devices

5-7Selector Light Pen
The selector light pen feature permits the operator
to select information from the display screen andcause the selections to be identified to theapplication program.
Set Up Keylock
The set up keylock feature controls access by theoperator to change the unit address of the terminal
through the keyboard.

Programming Support
Programming support for the 8775 is supplied by
the Distributed Processing Programming Executive(DPPX) and the Distributed Processing Control
Executive (DPCX) program products described
below.
DPPX Support
The DPPX base and associated DPPX program
products support consists of:• The 3270 Data-Stream Compatibility(DPPX/DSC) program product, which enables
existing System/370 applications to be used withthe 8775.
• Basic support for writing application programs.
Application programs that take advantage of the8775's enhanced functions can be written at thedata-stream level using DPPX Base support.
• High-level support for writing application
programs. The Distributed Presentation Services
program supplies high-level support for writing

5-8

IBM Input/Output Device Summary

applications that take advantage of 8775
functions. Such applications can be written in
COBOL (DPPX/COBOL) or Assembler(DPPX/ ASSM) language. The Distributed
Presentation Services program has twocomponents: Interactive Map Definition (a special
feature) and Format Management (the baseproduct). Interactive Map Definition enables
formatted screens to be interactively designed
during program development; Format
Management supplies an interface enabling theapplication program to use the screens that havebeen designed, and build the needed format on
the screen at run time.
• Control of the 8775 microcode library andloading of the 8775 enhanced function featureand the multiple partitions and scrolling feature.
• Support for the system copy feature (a feature
available only on Models 1 and 2).
DPCX Support
The DPCX Base program and DPCX Feature
support is as follows:• The single-station 8775 Display Terminal is
supported as a 3276.
• The 3270 Data-Stream Compatibility(DPPX/DSC) program product enables existing
System/370 applications to be used with the8775.
• The user programs can communicate with the8775 using full-screen processing.

Chapter 6. Magnetic Character Readers
The magnetic character readers use magnetic ink
character recognition (MICR) to read and sort cardand paper documents in banking applications. These
devices operate on documents whose type font
(MICR E13B, see Figure 6-3), print quality, andcode-line arrangement meet the specifications
recommended by the American Bankers Association.
See Figure 6-7 at the end of this chapter for acomparison of the characteristics of the magnetic
character readers.

Stackers
The 1255 has horizontal stackers, each of which canhold a 635 mm (2.5 in.) stack of documents.
Models 1 and 2 have six stackers in one verticalbay, and the Model 3 has 12 in two bays.

1255 Magnetic Character Reader
Models 1, 2, and 3
The 1255 Magnetic Character Reader (Figures 6-1
and 6-2) can read and sort a variety of magneticallyinscribed documents at relatively high speeds.

_

In a typical application, the 1255 performs selective
data storing from MICR-encoded checks for
updating of demand-deposit accounts. Continuous
document loading, optimum document stacking, andsimplicity of operation help improve throughput.
The 1255 is available in three models:• Model 1 reads and sorts up to five hundred 152
mm (6 in.) long documents per minute into six
stackers.
• Model 2 reads and sorts up to seven hundred fifty
152 mm (6 in.) long documents per minute into
six stackers.

Figure 6-1. IBM 1255 Magnetic Character Reader Modellor 2• Model 3 reads and sorts up to seven hundred fifty
152 mm (6 in.) long documents per minute into
12 stackers.
The speed of processing varies with the 1255 model
as well as with factors such as document length andpaper quality.
The highlights of the 1255 follow.
Attachment to a Processor
The 1255 needs one control unit position on asystem channel.
Document Feed
The documents can be intermixed and can range
from 64 to 108 mm (2.5 to 4.25 in.) wide, 146 to
225 mm (5.75 to 8.875 in.) long, and 0.076 to 0.178
mm (0.003 to 0.007 in.) thick.
Figure 6-2. IBM 1255 Magnetic Character Reader
Model 3

Chapter 6. Magnetic Character Readers6-\

Operator Panel
The operator panel contains switches, indicators, andan operator-resettable document counter. This panel
is grouped with the feed hopper and the stackers for
operator convenience. This grouping also makes
operator training easier, and helps minimize spaceneeds.
Offline Sorting
The 1255 can also be used offline to perform finesorting of checks (usually by account number) or
validity checking without sorting. An operator panel
switch permits the 1255 to change from online tooffline operation and vice versa.

S peciai Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Numbers

De,h Symbol

Amount Symbol

.0

II"

·On·U," Symbol

Transit Symbol

Figure 6-3. The 14 Magnetic-Ink Characters of Font
E13B

1419 Magnetic Character Reader
Modell. Data inscribed magnetically on checks (Figure 6-4)
and other banking documents is read at nominal
speeds of 1600 documents per minute by the 1419
Magnetic Character Reader (Figure 6-5). Specificspeeds vary with document length as well as withthe program used.
The highlights of the 1419 follow.
Attachment to a Processor

Dash Symbol Transmission

The 1419 needs a channel control unit position on asystem channel.

The dash symbol transmission feature transmits theE13B dash symbol from the transit field to storage.

Stackers

High-Order Zero & Blank Selection
The high-order zero & blank selection feature is anoffline feature for the Model 3. It permits selectionof specified documents into a specific stacker. These
are documents that have only blanks in the sortposition and in all higher order positions of the field.
Self-Checking Number/Improved Recognition
The self-checking number/improved recognition
feature reduces account number rejects besides
performing the basic self-checking number function.
The account field is especially subject to folds,
banding, and print specification deviations.
Character rejects are reduced relative to the damageof the documents, thereby reducing the user's
check-processing expense.
51-Column Card Sorting
The 51-column card sorting feature permits the1255 to read and sort 51-column cards that aremagnetically inscribed.

6·2

IBM Input/Output Device Summary

The 1419 has 13 stackers for a wide range ofsorting or selection needs. As the documents are
read, they can be sorted into as many as 13 pockets
classified as follows: A, B, 0 through 9, and R(reject). All magnetic inscriptions can be checked
for validity.
Document Feed
Documents read by the 1419 can be of intermixed
sizes and thicknesses, as typically encountered incheck-handling operations. The standard minimum
length is 152 mm (6 in.); shorter documents, such as, the 51-column postal money order need the51-column card sort feature and can be read into
the system at a maximum rate of 1960 per minute.
These shorter documents can be intermixed withstandard-length documents, and can also be sorted if
a no-charge 51-column card sorting special feature
for that purpose is installed. If the feature is notinstalled on the 1419, 51-column cards and otherdocuments shorter than 127 mm (5 in.) are sent to
the reject pocket. If the feature is installed, 1419
speed is reduced by an amount that increases

slightly with the average length of documents and is
4.3 percent for 51-column cards, and 5.3 percent for
152 mm (6 in.) checks.

the remaining digits are advanced under program
control.
Dash Symbol Transmission
The dash symbol transmissi9n feature distinguishes
U.S. from Canadian transmit-routing numbers(leftmost eight magnetic digits) to prevent
duplications.
Endorser

I -.---.--

Check
Routicg
SymbolABA
TrallSit
Number_______ T

Account
NumberPrequaJilled

I -...- I_ _ _ _ _ _ _ II

Process
Coctrol

Am"untPostqualified
Fi .... t Position Read -~----

Figure 6-4. Magnetic Inscription-Translation ofCharacters and Definitions of Fields

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Batch Numbering
The batch numbering feature supplies an automatic
method of advancing a batch number document
identification under program control. It contains a
six-position impact printer that prints up to 999,999
in anyone of six locations on the back of the
document. The high-order digit is set by hand and

The endorser feature permits the 1419 to print the
bank's endorsement on the back of each document
without reducing its operating speed.
Expanded Capability
The expanded capability feature supplies acommand for operation under as, which removes
the exposure to data overruns caused by 1419s
interfering with other 1419s operating on the samechannel.
Multiple Column Control
The mUltiple column control feature permits the1419 to select documents with specific numbers infour or less columns of any field.
Program Control for Pocket Lights
The program control for pocket lights feature
improves control of output batches by stopping thereading-sorting operation and turning on pocket
lights(s) when a predetermined number of
documents has entered one of the corresponding six
pockets (with a second feature, 12 pockets) specified
by the program.

Figure 6-5. IBM 1419 Magnetic Character Reader
Chapter 6. Magnetic Character Readers

6-3

Self-Checking Number
The self-checking number feature automatically
performs mathematical proof that account numbers
are correctly recorded and read.
Split Field
The split field feature separates any field into twoelements after the first ABA dash symbol that
follows a digit.
51-Column Card Sorting
The 51-column card sorting feature permits the1419 to sort 51-column card documents, which canbe intermixed with documents and cards within
specifica tions.

3890 Document Processor Models Al
through A6, and BI through B6
The 3890 Document Processor (Figure 6-6) has
continuous operation (often with only one operator)
for reading magnetically inscribed data from cardand paper documents into an IBM processor at a
rate of 2400 documents 152 mm (6 in.) long per
minute. Actual throughput varies with the length ofthe documents. The built-in control and logic
functions permit the 3890 to operate timeindependently of the IBM processor during online
operation. The 3890 can also be used offline fordocument sorting. It attaches to an IBM processor
through a byte or block multiplexer channel.
The six A models (AI through A6) and six B
models (Bl through B6) parallel each other innumber of pockets, starting with six in Models Al
and B 1, increasing by six for each succeeding model,
to 36 in Models A6 and B6. A models differ from
B-models in storage capacity. A models have a
13,312-byte storage capacity; B models have a
29,696-byte storage capacity, which permits

Figure 6-6. IBM 3890 Document Processor Model A3
6-4

IBM Input/Output Device Summary

customer-written stacker-select programs to uselarger sort tables than those which the A models
use. The storage capacity is reduced to 10,240 bytes
for A models and 26,624 bytes for B models whenthe 3890 is used for image processing (sorting bycomparing a document to an image in a buffer).
The highlights of the 3890 follow.
Stackers
Each stacker pocket holds 800 to 1000 documents
per pocket (up to 36 pockets are available). All but
the last 200 to 300 documents can be unloaded by
the operator without stopping the ·3890.
Input Hoppers
The input hopper with built-in jogger holds
approximately 4800 documents.
Merge Feed
The merge feed unit permits the merging of
documents into a normal input stream from aseparate hopper.
Logic and Control Section
The control program is loaded online from an IBM
processor or loaded offline from a removable IBM
diskette. The logic capability permits the following
standard programmable functions: split field,
self-check number verification, multiple-column
control, and base-number conversion.
Documents
The documents can be intermixed and can range
from 123 to 223 mm (4.85 to 8.75 in.) long, 70 to
106 mm (2.75 to 4.17 in.) wide, and 0.064 to 0.178
mm (0.0025 to 0.007 in.) thick.

Microfilming

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Item Numbering/Endorsing
The item numbering/endorsing feature permits theprinting of an eight-digit number or fullendorsement on the back of each document. The
new endorser design reduces the time needed tochange the plate by the operator. This is for usersthat have a need to print different endorsements fordifferent types of work.

Documents Sizes and Specifications
I/O Devices

Models

mm

in.

1255

1

w - 64 to 108
1- 146 to 225
t - 0.076 to 0.178

2.5 to 4.25
5.75 to 8.875
0.003 to 0.007

2
3

The microfilming feature permits selective filming ofsome or all items being processed without reducing
throughput. Document filming can be either front
and back or front only. Filming and indexing are
separately controlled. The film cassette (available asan accessory) has a capacity of up to 610 m (2000ft) of 0.069 mm (0.0027 in.) thick polyester
thin-base 16 mm film, which will record
approximately 380,000 front-and-back images of an
average document mix. Loading and unloading of
the film from the cassette into the film transport is
automatic under operator control.

Data Comparison Table
Figure 6-7 gives a comparison of data for themagnetic character readers mentioned in thischapter.

Maximum
Speed(Documents
Per Minute)
500 (6-inch
documents)

6

750 (6-inch
documents)

6

750 (6-inch
documents)

12

1600

13

1419

1

w - 70 to 93
1- 152 to 225
t - 0.076 to 0.178

2.75 to 3.66
6 to 8.875
0.003 to 0.007

3890

AI. Blw - 70 to 106
1- 123 to 222
t - 0.064 to 0.178

2.75 to 4.17
2400
4.85 to 8.75
(minimum)0.0025 to 0.007

A2. B2A3. B3

Stackers(Pockets)

6
12

Reading Capabilities-

Reads magnetically inscribed
MICR E13B printing thatmeets the specifications
recommended by the American
Bankers Association TechnicalCommittee on Mechanization of
Check Handling.

18

A4.B4

24

AS. B530

A6. B636

w - widthI - lengtht - thickness- There are more capabilities and features available; see the IBM sales representative for more information.

Figure 6-7. Comparison Data for Magnetic Character Readers

Chapter 6. Magnetic Character Readers

6-5Chapter 7. Magnetic Tape Devices
The IBM magnetic tape devices read and write on
12.7 mm (1/2 in.) magnetic tape mounted on reels.
The reels can be 158.75, 177.8,215.9, or 266.7 mm(6.25,7.0,8.5, or 10.5 in.) in diameter. The tapeunits, which operate at data densities of up to 6250
bytes per inch (BPI), use IBM Multi-System tape orcompetitive tape. Competitive tape formulations
should meet the tape requirements described in

Tape Requirements for IBM One-Half Inch Tape
Drives at: 556, 800, 1600, and 6250 BPI.
These devices operate in seven- or nine-track format
except the 8809, which operates in the nine-trackformat only. The seven-track format uses theseven-bit binary-coded decimal (BCD)
representation so that each track represents a bit of
the BCD code. The nine-track uses eight of the nine
bits for data and the last one for parity. The databits can represent an alphameric or special
character, two decimal digits, one signed decimal
digit, or eight binary digits.
One of the practical uses of the magnetic tapedevice is the creation of a data file on a reel of tapeso that it can be stored offline.
See Figure 7-5 at the end of this chapter for acomparison of the characteristics of the magnetic
tape devices.

3410 Magnetic Tape Unit Models 1
through 33411 Magnetic Tape Unit andControl Models 1 through 3
The 3410 Magnetic Tape Unit (Figure 7-1) and3411 Magnetic Tape Unit and Control are membersof the 3400-series tape unit family. The 3410 and
3411 tape subsystem includes one 3411 tape unit
and control and up to five 3410 tape units.
The 3410 and the 3411 look similar and eachcontains one tape unit, but the 3411 also contains
the common control unit and power supply. The
3411 Modell can attach up to three 3410 Model
1's, the 3411 Model 2 up to five 3410 Model 2s, andthe 3411 Model 3 up to five 3410 Model 3s.
The 3410 and 3411 are each available in threemodels, as follows:• Modell has a nominal data rate of 20 kilobytes
per second, a tape speed of 317.5 mm (12.5 in.)per second, and a rewind time of 3 minutes for a
full reel.

• Model 2 has a nominal data rate of 40 kilobytes
per second, a tape speed of 635 mm (25 in.) per
second, and a rewind time of 3 minutes for a fullreel.
• Model 3 has a nominal data rate of 80 kilobytes
per second, a tape speed of 1270 mm (50 in.) per
second, and a rewind time of 2 minutes for a fullreel.
The 3410 tape units must be the same model as the3411.
The highlights of the 3410 and 3411 follow.
Attachment to a Processor
The 3411 Magnetic Tape Unit and Control is very
versatile and attaches to various systems anddevices. It can attach to a control unit position on asystem channel, or through an integrated adapter ona system or device. The 3411 attaches to a byte
multiplexer channel, block multiplexer channel, or
selector channel.
Table-Height Horizontal Transport Deck
Both the 3410 and 3411 are desk-height units thathave tapes mounted horizontally rather thanvertically. A transparent sliding cover, similar to thecover of a roll-top desk, gives easy access to the tapereels.
Tape-Threading Path
A simplified tape-threading path and a push-pull
quick release latch (for quicker mounting andremoving of the tape supply reel) increase ease ofoperation.
Compact Design
The diagnostic capabilities of the units permit
normal servicing to be done from the front, andinternal cables between the tape units and the tapecontrol remove the requirement for under-the-floor
cables. Both these designs permit the units to beplaced side by side and near to walls, thereby
permitting better use of space.
Independent Tape-Unit Attachment
The method of attaching a 3410 to a 3411 (radialattachment) permits a 3410 to be taken out of
operation for maintenance without changing cables
or interrupting the work done by any of the otherunits.

Chapter 7. Magnetic Tape Devices

7-1Error Correction

Special Features

Single-track read errors are corrected in flight in
1600 BPI phase-encoding (PE) recording, andtrack-in-error detection is supplied for nine-track
800 BPI recording.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Parity Checking
Parity checking is done during tape reading (in both
800 and 1600 BPI recording) and during read-backcheck of tape ·writing.
Amplitude Checking
In 1600 BPI PE recording, the amplitude of thesignal is checked against a predetermined thresholdlevel. This check determines whether the signal ofthe data being recorded is strong enough to permit
the data to be read.
Read Backwards
Tapes can be read by the 3410 and 3411 in a
forward or backward direction. The data conversion
function is inoperative during a backward read
operation of seven-track tapes.

Dual-Density, Tape Unit
The dual-density, tape unit feature, available forboth the 3410 and 3411, permits the nine-track tapeunits to read and write either at 800 BPI in
non-return-to-zero change-on-ones recording(NRZI) mode or at 1600 BPI in phase-encoded
mode. This feature is especially useful in libraryconversion and for data interchange between
systems. Where only 1600 BPI PE operations are
performed, the single density feature is needed.
Seven Track, Tape Unit
The seven track, tape unit feature permits a 3410 or
3411 to operate at 200, 556, or 800 BPI in NRZI
mode, in seven-track format only.
Single Density, Tape Unit
The single density, tape unit feature permits the3410 or the tape unit on the 3411 to operate at
1600 BPI PE only.

3420 Magnetic Tape Unit Models 3
through 8
The 3420 Magnetic Tape Unit (Figure 7-2) offers
compatibility with existing seven- and nine-track
tape volumes and programs. It also offers enhanced
reliability, availability, and serviceability features.
The 3420 has six models, as follows:• Model 3 has a nominal data rate of 120 kilobytes
per second, a tape speed of 1.905 m (75 in.) per
second, and a rewind time of 60 seconds for a fullreel.
• Model 4 has a nominal data rate of up to 470
kilobytes per second, a tape speed of 1.905 m (75in.) per second, and a rewind time or 60 seconds
for a full reel.

Figure 7-1. IBM 3410 Magnetic Tape Unit Modell, 2,
or 3

7-2

IBM Input/Output Device Summary• Model 5 has a nominal data rate of up to 200
kilobytes per second, a tape speed of 3.175 m(125 in.) per second, and a rewind time of 60
seconds for a full reel.

• Model 6 has a nominal data rate of up to 780
kilobytes per second, a tape speed of 3.175 m(125 in.) per second, and a rewind time of 60
seconds for a full reel.

unit, sense small variations in the speed of thecapstan and the tape and generate corrective signals.
This precise control is one of the keys to the 3420's
quick read-access and rewind times.

• Model 7 has a nominal data rate of up to 320
kilobytes per second, a tape speed of 5.080 m(200 in.) per second, and a rewind time of 45
seconds for a full reel.

Automatic Threading and Cartridge Loading• Model 8 has a nominal data rate of up to 1250
kilobytes per second, a tape speed of 5.080 m(200 in.) per second, and a rewind time of 45
seconds for a full reel.
6250 BPI (GCR Mode)
6250 BPI is synonymous with group coded recording(GCR) and is a recording mode of the 3420 Models
4, 6, and 8. When the 3420 records at 6250 BPI(GCR mode), the nominal interblock gap (IBG) is
7.6 mm (0.3 in.), instead of 15.2 mm (0.6 in.) as at
1600 BPI (PE mode), and makes more tape space
available to the user.
Also with 6250 BPI (GCR mode), self-adjusting
gain control is used, which adjusts the read
amplitude to a signal recorded at the beginning of
the tape to improve read performance.
The highlights of the 3420 follow.
Attachment to a Processor
The 3420 Magnetic Tape Unit attaches to a control
unit position of a system or device through the 3803
Tape Control Unit.
Tape Path
Tape wear and contamination are minimized byextensive use of air bearings and surface treatments.
The path that the tape takes through the tape unit,
from reel to reel, permits the recording side of thetape to touch only two surfaces during read andwrite operations: the tape cleaner and theread/write head. In addition, the cleaningmechanism (supplied only on Models 4, 6, and 8)
removes loose contaminants from the tape andprotects the read / wri te head from tapecontamination during high-speed rewind and tapeload and unload operations.

An automatic reel latch mechanically seats the filereel in position and pneumatically locks it on the
hub for tape movement. With automatic threading
and cartridge loading, the time to mount andremove tapes is reduced.
Independent Tape-Unit Attachment
Radial attachment of a 3420 permits it to be takenout of operation for maintenance without changing
cables or interrupting the work done by any of theother units.
Nine-Track 1600 BPI Phase-Encoding Operation
Data is recorded parallel by bit, serially by byte at
1600 BPI, phase encoded, in nine tracks across thewidth of the tape. This operation can be available
on all models of the 3420. See special features.
Parity Checking (PE Mode)
Each byte is checked for odd parity while tape isbeing read. Data written on tape is read backinstantly and checked as in a read operation withfull parity checking.
Error Correction
Single-track errors consisting of missing or
incorrectly read bits are corrected "in flight"
during 1600 BPI PE read operation.
In 6250 BPI (GCR mode), there is "in-flight"
detection and correction of single-track errors on
write operations and double-track errors on read
operations.
Read Backwards
Tapes can be read by the 3420 in a forward or
backward direction. The data conversion function is
inoperative during a backward read operation ofseven-track tapes.

Read-Access Time
Each model of the 3420 has a short nominal
read-access time that can improve systemthroughput. Optical tachometers, built into the tape

Chapter 7. Magnetic Tape Devices

7-3

_.mu _I~---•

if a .ii" • •6250 Density

The 6250 density feature is for Models 4, 6, and 8
only, and permits the tape unit to operate in 6250
BPI nine-track format.
6250/1600 Density

The 6250/1600 density feature is for Models 4, 6,
and 8 only, and permits the tape unit to operate at
6250 BPI density and 1600 BPI density.

3803 Tape Control Models 1, 2,
and 3
The 3803 Tape Control (Figure 7-3) is the control
unit for the 3420 Magnetic Tape Unit. The 3803 ishalf the size of earlier IBM tape control units anduses monolithic circuitry for all logic and control
functions. The monolithic read-only control storageof the 3803 contains all the information needed tocoordinate effective operation of the 3420 Magnetic
Tape Unit. The 3803 also has diagnostic capabilities
that can quickly pinpoint problems.
The 3803 has three models, as follows:• Model 1 is the control unit for 3420 Models 3, 5,
and 7.
• Model 2 is the control unit for 3420 Models 3
through 8. Seven- and nine-track 3420s andmultiple densities can be mixed on the Model 2
when it has the appropriate features installed.
Figure 7-2. mM 3420 Magnetic Tape Unit

• Model 3 is the control unit for 3420 Models 3
and 5 for attachment to smaller IBM processors.

Special Features

The highlights of the 3803 follow.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Radial Attachment

Dual Density

The dual density feature is for Models 3, 5, and 7
only and permits the tape unit to operate in 800 BPI
NRZI nine-track format as well as in 1600 BPI PE.
Seven Track

The seven track feature is for Models 3, 5, and 7
only and permits the tape unit to operate at either
556 or 800 BPI NRZI in the seven-track format.

7·4

IBM Input/Output Device Summary

Through a radial interface attachment, up to eight
3420s can be connected to a 3803 in a way that
permits a 3420 to be taken out of operation formaintenance without changing cables or interrupting
the work done by any of the other units. This
attachment makes it possible to change tape units
online and offline for easier maintenance. (Earlier
IBM tape units are connected to their control units
serially through units placed next to them.)
EncOtJe Checking

The 3803 Model 2 uses an improved
encode-checking method that permits error
correction in 6250 BPI mode for any single track, ora combination of two tracks simultaneously, while
the tape is in motion.

Tape Switching
The tape switching feature on 3803 Models 1 and 2
permits as many as sixteen 3420s to be changed
among two, three, or four 3803s.
Two Channel Switch
With the two channel switch feature installed, a3803 Modell or 2 can attach to a second channel
and change between two channels under program
control. This feature permits one or more processors
to have access to tape units that otherwise might not
be available to them.

8809 Magnetic Tape Unit Models
lA, lB, 2, and 3
The 8809 Magnetic Tape Unit (Figure 7-4) supplies
high-speed save and restore capabilities for: DASD,
journaling for data base/data communication, tapeswapping, and processing of the host system.
The 8809 is available in four models, which may be
attached to either an 8100 System (four 8809s
maximum) or a 4331 or 4341 Processor (up to six
8809s maximum) . A Model 1A or 1B must be thefirst drive in the string. The attachment of the fourmodels is as follows :Figure 7-3. IBM 3803 Tape Control Unit Modell

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
The 3803 must have the appropriate density andtape format features to control the 3420 tape units
attached to it (such as single density, dual density,and seven track).
Remote Switch Attachment
The remote switch attachment feature (for the
Models 1 and 2 only) make possible the enablingand disabling of the two channel switch feature on
the 3803 from a remote console such as theconfiguration control panel of a System/370 Model
158MP or 168MP.

• Model 1A attaches either directly to the 4331 or
4341 Processor or to the 8101 Storage and I/O
Unit of an 8100 System. It supplies power to an
attached Model 2.
• Model 1B attaches directly to the 8100 Systembecause it contains a Tape Unit Adapter that is
not present in the Model 1A. It also supplies
power to an attached Model 2• Model 2 attaches to a MadellA or 1B and is thesecond, fourth , or sixth (4331 or 4341 Processor
only) unit in the string. This model contains nopower.
• Model 3 attaches to a Model 2 and is the third or
fifth (4331 or 4341 Processor only) unit. It
supplies power to an attached Model 2.
Each model can operate in start-and-stop or
streaming mode with a rewind time of 2.6 minutes
for a full reel.
The highlights of the 8809 follow .
Attachment to a Processor
The 8809 Magnetic Tape Unit attaches to an IBM
processor through an integrated tape adapter.

Chapter 7. Magnetic Tape Devices

7-5Tape Path
The 8809 uses a simplified reel-to-reel tape pathdesign. After the tape is threaded and loaded, thetape unit moves tape directly reel to reel, without
capstan or vacuum columns. The tape tension andvelocity are electronically controlled.
Environmental Conditions
The 8809 operates in a wider range ofenvironmental conditions than most other IBM tapeunits. This extended environmental range permits
the 8809 to operate at temperatures of 15.6 to
37.8°C (60 to 100°F) and relative humidities of 8%
to 80%. The swapping of a tape written on an 8809
operating in its extended environment with a tape
written on another IBM tape unit operating in its
normal environment can result in degraded
performance.
Reduced Maintenance
The 8809 tape unit uses integrated circuitry and asimplified reel-to-reel transport, which reduce theneed for maintenance and increase performancereliability. Preventive maintenance is not needed forthe 8809.
Figure 7-4. IBM 8809 Magnetic Tape Unit

Modes of Operation
The 8809 operates in two modes:• Start-and-stop mode, which moves tape at 317.5
mm (12.5 in.) per second with a nominal data
rate of 20 kilobytes per second and starts andstops within the IBG.
• Streaming mode, which moves tape at 2540 mm(100 in.) per second with a nominal data rate of
160 kilobytes per s~cond and maintains velocity
through the IBG while anticipating the next
command.
1600 BPI PE Mode
The 8809 uses the 1600 BPI phase-encoded tapeformat, which is compatible with IBM 2400-and
3400-series tape units.

7-6

IBM Input/Output Device Summary

Special Features
The following feature can be ordered through the
IBM sales representative to expand or customize theuser's operation. For more information about thisfeature, see the IBM sales representative.
8100 System Multi-Drive
The 8100 system multi-drive feature is needed on a8809 Model IB if more than one tape unit
(additional Model 2 or Model 3) is attached to an
8100 System.

Data Comparison Table
Figure 7-5 gives a comparison of data for themagnetic tape devices mentioned in this chapter.

Nominal Data Rates(kilobytes )er second)
Magnetic Tape
Unit

Tape Speed

NominalRead
AccessNominal Interblock-Gap
Time

Nominal Interblock Gap

RewindTime(sec)

RewindandUnload
Time

556
BPI

800
BPI

1600
BPI

Seven
or
Nine
Track
NRZI

Nine
Track
PE

6250
BPI

m/sec

in./sec

Time*
(ms)

Seven
Track

Nine
Track

6250
BPI

Seven
Track

Nine
Track

6250
BPI

Seven
Track

Nine
Track

6250
BPI

2400-ft.
Reel

2400-ft.
Reel

mm

in.

ms

Number

Model

Seven
Track
NRZI

3410/
3411

1

6.9

10

20

-

0.318

12.5

15.0

19.1

15.2

-

0.75

0.6

-

60.0

48.0

-

180

-

2

13.9

20

40

-

0.635

25.0

12.0

19.1

15.2

-

0.75

0.6

30.0

24.0

-

180

-

3

27.8

40

80

-

1.270

50.0

6.0

19.1

15.2

-

0.75

0.6

15.0

12.0

-

120

-

0.75

3420

3

41.7

60

120

-

1.905

75.0

4.0

19.1

15.2

-

0.6

-

10.0

8.0

-

60

66

4

-

-

120

470

1.905

75.0

2.3

-

15.2

7.6

-

0.6

0.3

-

8.0

4.0

60

66

5

69.5

100

200

-

3.175

125.0

2.9

19.1

15.2

-

0.75

0.6

-

6.0

4.8

-

60

66

6

-

-

200

780

3.175

125.0

1.6

-

15.2

7.6

-

0.6

0.3

-

4.8

2.4

60

66

7

111.2

160

320

-

5.080

200.0

2.0

19.1

15.2

-

0.75

0.6

-

3.8

3.0

-

45

51

8

-

-

320

1250

5.080

200.0

1.1

15.2

7.6

-

0.6

0.3

-

3.0

1.5

45

51

20

-

0.318

12.5

44.0

-

15.2

-

-

0.6

-

-

48.0

-

156

-

160

-

2.540

100.0

335.0

-

15.2

-

-

0.6

-

-

6.0

-

156

-

8809"

lA,IB,
2, 3--8809"*

lA,IB,
2,3--*The read access time is the interval from the beginning of a forward read operation, when the tape is not at a load point, until the first data byte is read after the tape has reached
the correct speed from a stopped state. The times given for 3420 Models 4, 6, and 8 are for 6250-BPI operation.
"8809 is operating in start/stop mode.
***8809 is operating in the streaming mode.

Figure 7-5. Comparison of Characteristics for Magnetic Tape Devices

Chapter 8. Optical Readers
Online optical readers can enter data into a system
directly from machine-readable source documents,
thereby eliminating transcription operations such ascard punching, verifying, and taping. This also
reduces data-entry transcription errors, one of themost important advantages of the optical readers.
Consequently, optical readers offer reduced
processing costs, quicker turnaround, fewer
data-entry errors, and improved overall systemefficiency. Nurses, teachers, sales people, meter
readers, driver's license applicants, and many others
can originate data that can be directly entered forprocessing. See Figure 8-7 at the end of this chapter
for a comparison of the characteristics of the opticalreaders.

1287 Optical Reader Models 1, 3,
and 5
The 1287 Optical Reader (Figure 8-1) can read
typed and machine-printed alphameric data andhand-printed numbers, letters, and marks fromcut-form documents that have a variety of formats,orientations, types of data, and field lengths. The
data of source documents can be organized in fixedor variable-length fields, in columns or rows, andcan be read in any sequence.

• Model 5 (Figure 8-1), as its basic function, reads
multiple lines of handprinted digits and somealphabetic characters (0 through 9, C, S, T, X,
and Z) from cut-form documents.
The highlights of the 1287 follow.
Attachment to a Processor
The 1287 contains its own control unit and needs acontrol unit position on a system channel. It can
attach to a byte multiplexer channel, block
multiplexer channel, or selector channel.
Document Sizes
The 1287 reads data from input forms in a variety
of widths and lengths. The document size can range
from 76 to 229 mm (3 to 9 in.) in length and 57 to
150 mm (2.25 to 5.91 in.) in width.
Throughput Rates
The speed of document processing varies with thesize of each document and the number of charactersand fields to be read, and is calculated fromestablished formulas. Maximum document
throug~put can be as high as 665 documents per
minute for 76 mm (3 in.) stubs, each with one fieldof 20 machine-printed characters.

The 1287 is available in three models:

Character Recognition• Modell reads up to 24 lines of data from adocument, each line having as many as 84
characters.

The 1287 reads the symbols and characters of the
OCR-A font sizes I and IV (Figure 8-2). Reading
ability can be expanded with special features. Whenthe 1287 encounters a character that it does notrecognize, it automatically starts another scan
operation. If the character is not recognized after
10 scan operations, the 1287 either displays the• Model 3 has the capabilities of the Model 1 plus
the ability to read the alphameric OCR-A fontsize I (Figure 8-2) printed by the IBM
SELECTRIC® typewriter or 1403 Printer.

Figure 8-1. IBM 1287 Optical Reader Model S
Chapter 8. Optical Readers

8-1

character on a cathode-ray tube for keyboard(online) correction and then goes to the next
character, or the unrecognized character istransmitted to the processor as the standard
EBCDIC substitute character code.

Farrington Selfchek 7B fonts, each in separate
specified fields in a document.
Numeric Handwriting

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Expanded Symbol Set
The expanded symbol set feature increases thereading capability of the 1287 Model 3 bypermitting it to read the symbols + = { } ? % ' "made by an IBM Selectric typewriter or similar
machine.
Farrington 7B Font
The Farrington 7B font feature permits Models 1
and 3 to read characters in Farrington Selfchek ®1
7B font on documents imprinted by credit-plate
imprinters.
Machine Printed OCR Font

The numeric handwriting feature permits the 1287
to read handprinted numbers and letters (0 through9, C, S, T, X, and Z, blockprinted with a No.2
pencil or with HB lead) and numbers printed in
Gothic 3/ 16-inch font.
Optical Mark Reading
The optical mark reading feature permits Models 1,
3, and 5 to recognize penciled marks entered asdata. The marks (made with a No.2 pencil) can bevertical, at an angle of 45 degrees, or horizontal.
Serial Numbering
The serial numbering feature permits
operator-controlled numbering of documents for·visual reading. Documents as small as 76 by 121
mm (3 by 4.75 in.) can be numbered from 00000 to
99999.
1428 and ANSCS OCR Font
The 1428 and ANSCS OCR font feature permits
Models 1 and 3 of the 1287 to read the 1428 and
OCR-A fonts separately in specified fields in adocument.

1288 Optical Page Reader Model 1

The machine printed OCR font feature permits the
Model 5 to read numeric 1428, OCR-A, andThe 1288 Optical Page Reader (Figure 8-3) reads
data from cut-form documents that range in size
from 76 by 165 mm (3 by 6.5 in.) to 229 by 356

1 Trademark of Farrington Manufacturing Company.

OCR-A Font
IBM 1428 Font
Size I

I

Size TI[

Farrington
Selfchek 7B*
Font

Handprinted
Character
Set

0

0
I

0

2

1

0

0

0

1.

1

],

2

2

3

3
4

Eo

5

6

5·
6

7

7

8

8

g

c

9

c

N

N

S
T

S
T
X

X

Z

z

I

I

2
3
4

5
b
7
&
9

1
2
3
If

5
b

1
8
9

3

If
5
b

7
8
"I
C
5
T

Z
X

.r
~

blank

blank

blank

Note: Characters and symbols are shown reduced in size.

Figure 8-2. Fonts, Letters, and Symbols Read by the 1287
IBM Input/Output Device Summary

DAN

:

DAN

1 B 0

P

2 C P

2 C P

e

d

3 D Q
4 E R /

3 D Q
4 E R /Jy

5 F S b G T *5 F S 6 G T *4

8 I V g
9 J W IY II:: X -8 I V &\>\

~ M Z blank

~

10

'"

b

7 H U $

.r L Y

blank
Expanded Symbol Set

I

+ %

= ?
{
}

*Farrington Selfchek 7B shown by permission of Farrington Manufacturing Co.
**NCR Optical Font shown by permission of National Cash Register Co.

8-2

0

OCR-A Font Size 1
IBM 1403
IBM SELECTRIC(or equivalent)(or equivalent) ®

180 ;

8

Y

of

NCR Optical
Font (NOF)**

9n

7 H U $9 J W

Y II:: X.r L YM Z
blank

mm (9 by 14 in.). Because the 1288 can read mixed
data on documents smaller than punched cards andas large as legal-size forms, it can be used in avariety of applications in government, business, andindustry.
"
The highlights of the 1288 follow.

Attachment to a Processor
The 1288 contains its own control unit and needs acontrol unit position oh a system channel. It can
attach to a byte multiplexer channel, block
multiplexer channel, or selector channel.
Modes of Operation
The 1288 can process both formatted andunformatted documents. In formatted mode, the1288 reads fixed- and variable-length fields in any
sequence. In unformatted mode, the machine reads
multiple and continuous variable-length lines ofalphameric data, up to 6 lines per inch, right- or
left-justified.

Unrecognizable Characters
When the 1288 encounters a printed Gothic or
handprinted character that it does not recognize, it
automatically scans it again. If the character
remains unreadable, the 1288 transmits a substitutecharacter to the processor and, under program
control, sends the document to the output stacker
for offline correction.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Expanded Symbol Set
The expanded symbol set feature permits the 1288
to read the symbols + = { } % ? ' " made by an
IBM Selectric typewriter or similar machine.

Processing Speed

Numeric Handwriting

The speed of document processing varies with thesize of each document, the format (if any), anti theorganization of the processing program, and can becalculated from established formulas.

The numeric handwriting feature permits the 1288
to read handprinted numbers and letters (0 through9, C, S, T, X, and Z) and printed numbers in
3/ 16-inch Gothic font.

Input Hopper

Optical Mark Reading

The input hopper unit of the 1288 can hold a 254
mm (10 in.) stack of documents, and the two output
stackers can hold either a 114 mm (4.5 in.) stack ofshort documents or a 76 mm (3 in.) stack of long
documents. Each document, after being read, isrouted to one of the two output stackers, one ofwhich is reserved for documents that contain
unrecognizable characters.

The optical mark reading feature permits the 1288
to read vertical or 45-degree-angle penciled lines
entered as data.
Serial Numbering
The serial numbering feature permits operatorcontrolled numbering of documents for visual

Figure 8-3. IBM 1288 Optical Page Reader
Chapter 8. Optical Readers

8-3

reading. Documents as small as 76 by 121 mm (3by 4.75 in.) can be numbered from 00000 to 99999.

3881 Optical Mark Reader Modell
The 3881 Optical Mark Reader Model 1 (Figure8-4) is well suited for convenient, quick, andeconomical data input in a variety of applications inindustry, commerce, and institutional organizations.
This high-speed optical mark reader reads penciled
and machine-printed marks on a variety of
document sizes, weights, and formats .
The highlights of the 3881 follow.
Attachment to a Processor
The 3881 contains its own control unit and needs acontrol unit position on a multiplexer channel.
Form Sizes
The 3881 is flexible. It can be easily adjusted so as
to read data from forms ranging in size from 76 by
76 mm (3 by 3 in.) bill stubs to 229 by 305 mm (9by 12 in.) sheets. It accepts paper ranging from
20-pound stock to card stock and it can read as
many as six different formats on the same-size
document, in a single pass.
Document Feed
Documents are sent through the read area from a
600-sheet hopper and then into one of two stackers,
in the sequence in which they are entered. The
processed documents go into a 600-sheet stacker,
and those with errors are sent to a 100-sheet selectstacker.
Processing Speed
The 3881 can read as many as 100 documents 76 by
76 mm (3 by 3 in.) per minute and 66 documents
216 by 279 mm (8.5 by 11 in.) per minute. Data issent to the processor, one page at a time, from the3881 buffer.
Functional Units
The 3881 can do a variety of applications because of
its internal processor, its high-density mark reading(up to 2480 mark positions per 229 by 305 mm (9by 12 in.) form, and its flexible forms-feedingtransport. Adjusting the reader for documents ofdifferent sizes takes only a few seconds.

Figure 8-4. IBM 3881 Optical Mark Reader

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
BCD Read
The BCD read feature permits the 3881 to readturnaround documents, which are forms printed byline printers as output from a data-processing
system, distributed for action, then returned to beread as input to the system.
Document Counter
The document counter feature makes available two
5-position counters, which can be increased by one
for each document processed by the 3881 . The
counters can be reset to zero by hand. Counter 1
increases by 1 for each document processed andcounter 2 increases by 1 for each document routed
to the select stacker.
Dual Density
The dual density feature permits the 3881 to writeon the 3410 Magnetic Tape Unit in either 800 BPI
NRZI or 1600 BPI phase-encoded modes.
Expanded Storage
The expanded storage feature gives an additional
512 bytes of storage needed in situations where the

8-4

IBM Input/Output Device Summary

number of formats, fields, and characters processedis more than the maximum number of positions
available in the basic data storage.
Serial Numbering
The serial numbering feature permits operatorcontrolled numbering of documents for visual
reading. Documents as small as 76 by 121 mm (3by 4.75 in.) can be numbered from 00000 to 99999.

3886 Optical Character Reader
ModellThe 3886 Optical Character Reader (Figure 8-5) isan online optical reader for an IBM processor. The
3886 is a compact, economical version of the larger
IBM optical character readers. This bufferedgeneral-purpose unit reads machine-printed OCR-Aand -B font characters and symbols, handprinted
numbers, and printed 3/ 16-inch Gothic numbers(Figure 8-6) from a variety of documents.

shades. The 3886 reads multiple lines of print fromforms ranging in size from 76 to 229 mm (3 to 9in.) wide (the direction of printing), and 76 to 305
mm (3 to 12 in.) long. The acceptable weight ofpaper ranges from 16-pound stock to card stock.
Functional Units
The 3886 has one input hopper and two output
stackers, each of which can hold a one-inch stack of
documents. The two stackers permit separation of
the processed documents from the documents
containing errors.
Control Circuits
The 3886 uses several new technologies that make it
a compact and highly reliable modular device. A
powerful microcoded recognition and control
processor performs machine-control andcharacter-recognition functions, permitting the 3886
to perform sophisticated data and blank editing aswell as output record formatting.
Processing Speed
The speed of document processing varies with
document length, number and kind of characters to
be read, amount of editing and formatting specified,
and the programs used. Speeds range fromapproximately 4.4 to 94 documents per minute. The
low rate could be, for example, for 216 by 279 mm(8 .5 by 11 in.) sheets with 29 lines per sheet, 78
characters per line (approximately 2260 characters);
the high rate could be for 76 mm (3 in.)machine-printed turnaround documents, each with asingle eight-character line.
Alphameric OCR -A Font
A8CDEFGHIJKLMNOPQRSTUVWXYZ
0123456789. ' ;=+/ . . "& 1'-{}%?YrlJ'.:1: 1

Blank

Alphameric OCR-B Font

Figure 8-5. IBM 3886 Optical Character Reader

The highlights of the 3886 follow .

AS CDE FGH I J K LMN OPQ RST UVWX Y Z

012 34 567 8 9 1. <> +&*- 1, Blank
US IH¥ ;6;NIt 00

Attachment to a Processor
The 3886 contains its own control unit and needs acontrol unit position on a system channel. It can
attach to a byte multiplexer channel, block
multiplexer channel, or selector channel.

~--

one

one

one

Num eric Handprint Character Shapes:0/ I /2/3/'+ /S/bn/8/9/X/
3 / 16·inch Gothic Font

0123456789

Document Feed
Note : C haracters and symbols are shown reduced in size .

The documents can have a variety of formats, typesof data, field lengths, and background colors andFigure 8-6. Fonts, Letters, Numbers, and Symbols Readby the 3886 Model 1

Chapter 8. Optical Readers

8-5

Numeric Handwriting

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Data Storage, Additional
OCR-B font and numeric handprinting recognitionneed the data storage, additional feature to executethe more complex character shapes that appear inthem.
Hopper and Stacker Capacity, Additional
The hopper and stacker capacity, additional feature
permits the 3886 hopper and stacker to hold 102
mm (4 in.) stacks of documents.
Instruction Storage, Additional
The instruction storage, additional feature supplies
the necessary additional storage increases of 8192
bytes for microcode that needs storage capacity
greater than is available in the basic 3886 storage.
Line Marking
The line marking feature permits the 3886 to printanyone of 15 codes on any line of a document anda t the bottom of a page. The user chooses themeaning and application of the codes, such as
pointing to a field in error or indicating one type oferror in the line.

The numeric handwriting feature makes it possible
to have machine reading of handprinted numbers
and the letter X.
Serial Numbering
The serial numbering feature permits operatorcontrolled numbering of documents for visual
reading. Documents as small as 76 by 121 mm (3by 4.75 in.) can be numbered from 00000 to 99999.
Tape Adapter, Dual Density
The tape adapter, dual density feature supplies theadapter for the 3886 to attach a 3410 Magnetic
Tape Unit Model 1 for recording in 1600 BPI PE or
800 BPI NRZI mode.
Tape Adapter, Single Density
The tape adapter, single density feature supplies theadapter for the 3886 to attach a 3410 Magnetic
Tape Unit Modell for recording in 1600 BPI PE
mode.
Video Collect Features
The various video collect features permit the direct
attachment of a display station to the 3886.

Data Comparison Table
Figure 8-7 gives a comparison of data for the opticalcharacter readers mentioned in this chapter.

Reading Capabilities*

Document Sizes
I/O Devices

millimeter

inch

BCD

Handprinting
Numbers

Mark Read

OCR-A

OCR-B

1287

w - 57 to 76
1- 76 to 229

2.25 to 5.91
3 to 9

no

yes

no

yes

no

1288

w - 76 to 229
I - 165 to 356

3 to 96.5 to 14

no

yes

yes

yes

no

3881

w - 76 to 229
1- 76 to 305

3 to 93 to 12

yes

no

yes

no

no

3886

w - 76 to 229
1- 76 to 305

3 to 93 to 12

no

yes

no

yes

yes

w - width
I -length*There are more capabilities and features available; for more information see the IBM sales representative.

Figure 8-7. Comparison Data for Optical Character Readers

8-6

IBM Input/Output Device SummaryChapter 9. Printe.r-Keyboards
The printer-keyboard units permit interaction
between the system and the operator; this results ina message flow between the operator and thesystem.

3215 Console Printer-Keyboard
ModellThe 3i15 Console Printer-Keyboard (Figure 9-1)
permits communication between the system and theoperator, and gives printed output. Under program
control, printing occurs at up to 85 characters per
second, relative to the system.

Characters Printed
The 3215 prints 26 alphabetic, 10 numeric, and up
to 29 special characters from the extended binarycoded decimal interchange code (EBCDIC). Other
unique graphics are available for language andspecial character needs.
Control Functions
All functions of the 3215: printing, spacing, carrier
return, and vertical spacing are controlled either byhand or by program control.

The highlights of the 3215 follow.
Printer Characteristics
Character spacing is 10 characters per inch and up
to 126 characters per line. Both left and rightmargins are fixed as specified by the platen width
used. Vertical single spacing is 6 lines per inch;
double spacing is 3 lines per inch. All power,
control, and data signals come from the processor.
Figure 9-1. IBM 3215 Console Printer-Keyboard

Chapter 9. Printer-Keyboards

9-1Chapter 10. Printers
The printers described in this chapter are document
output devices for IBM processors. They all print on
continuous forms. Each printer can either print acharacter at a time, a line at at time, or a page at atime. The rated speed of these printers varies from85 characters per second to 215 pages (8-1/2 in.
page) per minute. The printed line may be from 96
to 204 characters long. The vertical line spacing
may vary from 6 to 12 lines per inch and the pitch
may be 10, 12, or 15 characters per inch. Eachprinter has characteristics and features that aresuitable for its different applications.

The Model 7 is the only model that does not have adual-speed carriage and therefore has only low-speed
skips.
CoversThe 1403 Model N I (Figure 10-3) differs from theother 1403 models because it has sound-absorbent
covers that extend to the floor, power-operated front
and top covers, and a forms cart.

See Figure 10-17 at the end of this chapter for acomparison of the characteristics of printers.

1403 Printer Models 2, 7, and Nl
The 1403 is available in three models (Figures 10-1
and 10-3), as follows:• Model 2 has 132 print positions and prints up to
600 lines per minute.
• Model 7 has 120 print positions and prints up to
600 lines per minute.
• Model N 1 has 132 print positions and prints up
to 1100 lines per minute.
Models 2 and Nl can operate at still higher speedswith the universal character set feature, describedlater.
The highlights of the 1403 follow.
Attachment to a Processor
The attachment and control for 1403s are supplied
by a 2821 Control Unit or by an integrated printerattachment. Up to three 1403s can be controlled bya 2821 and the number is determined by the 2821
model. One 1403 can be controlled by an integrated
printer attachment. The 2821 needs a control unit
position on a system channel and can attach to abyte multiplexer channel, block multiplexer,
channel, multiplexer channel, or selector channel.
Dual-Speed Carriage
The dual-speed carriage supplies a high-speed and alow-speed forms skip operation, as follows:• High-speed skips are at 1.9 m (75 in.) per second
when more than eight lines are skipped.
• Low-speed skips are at 86 mm (33 in.) per
second.

Figure 10-1. IBM 1403 Printer Models 2 and 7

Print Cartridge
Models 2 and 7 use a chain of linked characters forprinting, and the Model N I uses a train ofcharacters not linked together. Characters are
printed 10 to the inch, and lines are spaced either 6
or 8 to the inch under operator c.ontrol.
At least one 1416 Interchangeable Train Cartridgeis needed for each Model N 1. The chain or train
cartridge has 240 type positions, which, before theintroduction of the universal character set (UCS)
feature, were divided into five equal sets of 48
characters each. The rated maximum printing speedof a given printer is based, partially, on this division
into five equal sets. If characters are included only
once, twice, or even four times on the chain or train,
the rated maximum printing speed is necessarily
reduced. The reduction, however, is not linear,because of factors other than the number ofChapter 10. Printers

10-1character sets (for example, single spacing versus
skipping) . Conversely, if the characters are included
more than five times, the printing speed is increased
beyond the rated maximum.
As already indicated, the Model 2 has a maximum
rated speed of 600 lines per minute (lpm) when its
chain contains the conventional five sets. If theinstalled set contains 240 different characters (thewidest possible variety), printing takes place on the
Model 2 at up to 140 lpm. Under the same
conditions, printing takes place on the 1403 ModelNl at up to 310 lpm. The maximum printing
speeds, with UCS, are controlled electronically andare 750 lpm for Model 2 and 1400 lpm for Model
Nl.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operations. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Width

Maximum
Number of
Tapes

mm

in.

Characters per Tape

4

79

3.1

29

8

38

1.5

13

Note: A combination o/widths less than 335 mm (13.2 in.)wide can be printed.

Figure 10-2. Selective Tape Characteristics for the 1403

Each tape is individually line-spaced under program
control, with no skipping permitted. The operator
can easily change from tapes to standard forms, orvice versa. A newer selective tape listing feature isavailable for a Model Nl. This feature permits
skipping at the rate of 838 mm (33 in.) per second
over a distance fixed by IBM Field Engineering
adjustment at a value in the range of 76 to 558 mm(3 to 22 in.); this is instead of the repeated line
spacing needed by the other type of selective tapefeature. Operation is quieter. Change-over fromtape listing mode to full-sheet printing is made stilleasier; this and other new operator conveniences
have a beneficial effect on the feature's overall
efficiency.

Auxiliary Ribbon Feeding
The auxiliary ribbon feeding feature adapts Models
2 and 7 for the use of polyester ribbons, which give
sharper impressions. This feature is standard on the1403 Model Nl.
Interchangeable Chain Cartridge Adapter
The interchangeable chain cartridge adapter feature
is available for Models 2 and 7. It permits theoperator to insert an interchangeable chain cartridgewith different type font, style, or special character
arrangement. The cartridge adapts the 1403 forquick and convenient changing of type fonts or
character arrangements for special printing jobs.
Selective Tape Listing
The selective tape listing feature is available forModels 2 and Nl. i t gives the capability of
substituting longitudinal strips for the normal paper
sheet forms . See Figure 10-2 for the different
selective tape formats available.
Figure 10-3. IBM 1403 Printer Model Nl

Universal Character Set
The universal character set (UCS), is available forModels 2 and Nl. It gives the user the ability toload into a special storage area in the 2821 Control
Unit any set of discrete codes up to a maximum of
240. The codes in 2821 storage match specifically

10· 2

IBM Input/Output Device Summaryand sequentially the characters on the train or
chain. The user can order any characters for a given
set, including custom designs for special
applications.

1443 Printer Model Nl
The 1443 Printer Model Nl (Figure 10-4) prints
from 200 to 600 (maximum) lines per minute, andthe print speed is determined by the number ofcharacters in the set being used.
The highlights of the 1443 follow .
Character sets
The 1443 Model Nl prints up to 600 lines per
minute with a 13-character set. The 1443 also has
39-, 52-, and 63-character sets which print at 300,
240, and 200 lines per minute, respectively.
The 52-character set is standard, and the other sets
are available through the selective character set
special feature. The user can order any charactersfor any set, including custom-made designs ofspecial graphics.
Print LineThe standard print line for all sets is 120 characterslong, spaced horizontally at 10 characters to theinch. Twenty-four additional printing positions areavailable as a special feature, increasing the total
number of printing positions to 144.
Printing Operation
All characters of the print set are on one type barthat moves back and forth across the paper. The
bar is so made that each different character passes
each print position. Printing takes place when thecharacter to be printed matches the character readfrom the printer's self-contained storage buffer.
Carriage Control
A tape-controlled carriage, working under program
control, advances paper and supplies the verticalprint formats. Lines are spaced 6 or 8 to the inch
under operator control. Skipping is at 381 mm (15in.) per second.
Attachment to a Processor
No external control unit is needed for attachment;
the control circuits and print storage buffer are
inside the 1443 Model Nl. The 1443 needs acontrol unit position on a system channel.

Figure 10-4. IBM 1443 Printer Model NlSpecial Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Print Positions, 24 Additional
The print positions, 24 additional feature increases
the print span from 120 to 144 positions.
Selective Character Set
The selective character set feature is needed if any
type bar other than the standard 52-character bar isused. This feature supplies the controls that permit
the 1443 to use all available character sets.

2821 Control Unit Models 1, 2, 3, 5,
and 6
The 2821 Control Unit contains the control andbuffer circuits to transmit information between theassociated channel and the 2540 Card Read Punch,and one or more 1403 Printers Model 2, 7, or N 1.
Each of the five models of the 2821 supplies control
for the following types and quantities of I/O
devices:• Model 1 controls a 2540 Card Reader Punch andone 1403 Printer.
• Model 2 controls one 1403 Printer.

Chapter 10. Printers

10-3• Model 3 controls two 1403 Printers and cancontrol a third 1403 Printer that has the third
printer control special feature installed.
• Model 5 controls a 2540 Card Read Punch andtwo 1403 Printers, and can control a third 1403
Printer that has the third printer control special
feature installed.
• Model 6 controls a 2540 Card Read Punch withno printer attachment.
Buffers• 1200 for Model 4• 1200 for Model 5
The highlights of the 3203 follow.
Train Printing
The 3203 uses the IBM 1416 Interchangeable Train
Cartridge, which is the same cartridge used by the1403 Model Nl. The train printing method used by
the 1403 Model N 1 and 3203 maintains ahigh-quality of printing.

The buffers in the 2821 permit the sending ofaccumulated data to and from the channel at amuch quicker rate per byte than would be possible
by direct transmission to or from the attacheddevice.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features , see the IBM sales
representative.
Column Binary
The column binary feature can be installed on the2821 Model 1, 5, or 6 to permit multiple punchingin rows 1 through 7 of a card column, or thereading of such multiple punches by the 2540. Thisfeature is not needed to read or punch EBCDIC.
(See "2540 Card Read Punch" in Chapter 11 formore information on the column binary feature .)Third Printer Control
The third printer control feature (for Models 3 and5 only) attaches a third printer. Any model
combination of 1403s can be used.

3203 Printer Models 1 through 5
The 3203 Printer (Figure 10-5) combines advanced
functions and components to offer greater speed,
quieter operation, improved efficiency, and greater
reliability than is now available with the 1403
Printer.
All models of the 3203 print either 6 or 8 lines perinch, under operator control. The printing rates inalphameric lines per minute follow :• 600 for Model 1• 1200 for Model 2• 1000 for Model 3

10-4

IBM Input/Output Device Summary

Figure 10-5. IBM 3203 PrinterAttachment to a Processor
The 3203 Models 1 through 4 attach to processorsthat have an integrated 3203 printer attachment,
thereby eliminating the need for a separate channel
or control unit. Only the 3203 Model 5 attaches toa control unit position on a channel because it has
an internal control unit.
Forms
The 3203 uses margin-punched, pin-fed, continuous
forms. The size of individual documents that makeup the continuous forms can range from 88.9 to 508
mm (3.5 to 20 in.) wide and from 76 to 610 mm (3to 24 in.) long.
Universal Character Set
The universal character set (UCS) gives the user theability to load, into a special storage area, any set of
discrete codes up to a maximum of 240. The UCS
permits optimizing the character arrangement tomaximum printing speeds for different applications.

Power-Assisted Stacker
A power-assisted stacker improves the stacking offorms and reduces the need for operator attention.

lines are spaced either 6 or 8 to the inch underprogram control.
The highlights of the 3211 follow.

Forms-Control Buffer

Attachment to a Processor

The forms-control buffer controls the vertical format
and movement (spacing and skipping) of the forms,
and removes the need for separate carriage-control
tapes.

The 3211 Printer is controlled and buffered by a3811 Control Unit. The control unit is physicallyattached to the 3211 Printer. The 3811 needs acontrol unit position on a system channel and can
attach to a byte multiplexer channel, block
multiplexer channel, multiplexer channel, or selector
channel.

Vacuum Cleaning System
The vacuum cleaning system continuously cleans theprint train, and the operator can also use it to clean
the print area.

Special Features
The following feature can be ordered through the
IBM sales representative to expand or customize theuser's operation. For more information about thisfeature, see the IBM sales representative.
Speed Enhancement
The speed enhancement feature gives the Model 3
the capability to operate at 1200 lines per minute.

Interchangeable Train Cartridge
The 3216 Interchangeable Train Cartridge contains
a continuous train of 432 characters. EBCDIC
permits using up to 254 different characters(alphabetic, numeric, and special) on a print train.
U nh'ersal Character Set
The universal character set (UCS) gives the user theability to load, into a special storage area, any set of
discrete codes up to a maximum of 240. The UCS
permits optimizing the character arrangement tomaximum printing speeds for different applications.

3211 PrinterProgram-Controlled Carriage

The 3211 Printer (Figure 10-6) is a high-speed
printer with speeds of 2000 lines per minute single
spaced, using a 48-element character set. The
printer uses a train of characters that are not linked
together. Characters are printed 10 to the inch, andThe vertical format for each form is stored in thecontrol unit by the program. Forms movement(spacing and skipping) is initiated by the programas specified in the stored format. Line feeding (6 orFigure 10-6. IBM 3211 Printer and IBM 3811 Printer Control Unit
Chapter 10. Printers

10-5

OCR Print Package

8 lines per inch) is also controlled by the stored
format.
Form Sizes
The form width can vary from 88 .9 to 476.25 mm(3.5 to 18.75 in.); the minimum length is 76 mm (3in.).
Self-Adjusting Power Stacker
The self-adjusting power stacker advances andstacks the forms for optimum high-speed forms
movement. It varies with the thickness of the forms.

The OCR print package feature supplies additional
manual operator platen controls needed for
optical-character-recognition (OCR) applications.
Print Positions, 18 Additional
The print positions, 18 additional feature increases
the print positions from 132 to 150. The operationof the 3211 remains the same.

3262 Line Printer Models 1, 2, 3, 11,
12, and 13

Automatic Forms-Thickness Control
The automatic forms-thickness control adjusts theplaten to the appropriate setting for the forms used.
This ensures maximum print quality and maintains
enough clearance for high-speed forms movement.
Motorized CoverThe cover on the printer gives controlled access tothe forms transport area. When a forms condition
occurs, the cover movement immediately alerts theoperator that action is needed.

The 3262 Line Printer (Figure 10-7) is controlled by
the host system. It supplies impact printing
capabilities for small and intermediate systems. The
3262 uses a steel band etched with 288 characters.
Continuous forms are pin fed and margin holes are
already punched. The pin-feed tractors can be
adjusted to feed forms from 89 to 406 mm (3.5 to
16 in.) overall width. The form length can be 76 to
356 mm (3 to 14 in.).

Speed
The printer speed varies with the arrangement of
the characters in the type array and the number ofarrays in the print train. By optimizing theuniversal character set, each application can attainmaximum printing speeds, based on the frequency ofthe characters in the print train. Speeds of up to2500 lines per minute, with reduced character sets
and customized print trains, are possible.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Print Belt
Character Per
Set

48
64
96
128

Nominal Speed ~ per minute)
ModellModel 11

Model 2Model 12Model 3Model 13

650
465
364

325
230

650
465

325
230

650
465

325

180
125

364
252

180
125

364

230
180

252

125

252

Figure 10-8. Comparison of 3262 Printer Rated Speeds
10-6

Figure 10-7. IBM 3262 Line PrinterIBM Input/Output Device Summary

The rated printing speed in lines per minute(single-spaced) varies with the size of the characterset on the print belt. See Figure 10-8 for the rated
speed of the 3262 Models 1, 2, 3, 11, 12, and 13.

or 8 lines per inch. System programs control all
printing and forms movement.

The highlights of the 3262 follow.

The 3262 models attach to the system throughcables to the printer control, as shown in Figures
10-9 through 10-11.

Print Characteristics

Attachment to a Processor

The print line is 132 characters long, spaced 2.54
mm (0.10 in.) on centers. Vertical line spacing is 64331 Processor (Host System)-

3262 Printer Model 1 and 11

r--S

~

Command Register
Carriage andCarriage Control
Forms Control Buffer
(FCB)

r--

-

S

E

E

R
0

R
f-0

E

E

S

S

'---

-------"'----~----

Universal Character
Set Buffer (UCSB)(Print Belt I mage)~r---e--

Print Line Buffer
(PLB)

~

Sense/Status Registers

Print Control
and Print Mechanism--

Figure 10-9. Attachment of IBM 3262 Models 1 and 11 to a 4331 Processor

Chapter 10. Printers

10-7

I

Host
System/370

I
8130/8140
Processor

I)

11

Other
DeviceI

I

3262 Printer Models 2 and 12- Operator Panel

DirectAttached
Loop

Loop
Station
Adapter

Loop
Cable

~

I

~

Microcode
Control Unit---

I Storuge I

t

r-

-

Print Control and
Print Mechanism-

Print Data
Buffer

LB~e.::.. .J

Other
DeviceI-

Status Register

Figure 10-10. Attachment of IBM 3262 Models 2 and 12 to an 8130 or 8140 Processor
3262 Printer Models 3 and 13
Host
SystemProcessor
I~3274/3276
Control Unit
Display Station

Coaxial
Cable

Line
Adapter-

Microcode
Contr91 Unit

Operator's Panel-~~

Print Data
Buffer~Status Register

I Storage I
Buffer

L_..J

Figure 10-11. Attachment of IBM 3262 Models 3 and 13 to a 3274 or 3276 Control Unit

10-8

IBM Input/Output Device Summary~~

Print Control and
Print Mechanism~

3800 Printing Subsystem

Forms

A special feature permits input of data frommagnetic tape without attachment of a printeroutput unit to a system.

The 3800 uses single-ply, edged-punched,perforated, and stacked continuous forms in any
combination of five lengths and 10 widths(common-use sizes). ISO (International
Organization for Standardization) sizes are available
for World Trade, except in North America. Printing
is repeated for multiple copies, so every copy has thequality of the original.

The highlights of the 3800 follow .

Print Line

Attachment to a Processor

The 3800 has a maximum of 136 print positions at
10 characters per inch (cpi) and 163 and 204
positions at 12 and 15 cpi, respectively. See Figure
10-13 for rated speeds of the 3800 Printer. The
vertical line spacing is under program control andcan be 6, 8, or 12 lines per inch (separately or
mixed on a page). There are 20 different character
sets, including six special underscored sets.

The 3800 Printing Subsystem (Figure 10-12) is ahigh-speed, nonimpact printer that producescharacters on paper through electrophotographic andlaser technology.

The 3800 needs a control unit position on a systemchannel or a tape-to-printing subsystem feature.
The control unit position on a system channel can beon a byte multiplexer channel, selector channel,
block multiplexer channel, or multiplexer channel.

Figure 10-12. IBM 3800 Printing Subsystem

Chapter lO. Printers

10-9

Forms Len2th

Lines Per Minute (Sin2le Copy)mm

Forms Per
Minute(Maximum)6 Lines per
Inch

8 Lines per
Inch

12 Lines per
Inch

3-1/2

90

526

7,890

10,52015,780

5-1/2

140

334

9,018

12,024

18036
18,936

in.

7

178

263

9,468

12,624

8-1/2

216

215

9,675

12,90019,350

11

279

167

10,02013,36020,040Figure 10-13. 3800 Print Speed Ranges

Electrophotographic Process

Electronic Character Generation

The 3800 uses an electrophotographic process, which
includes the following:

Graphic character modification permits user- or
IBM -designed characters to take the place of an
equal number of standard characters in thecharacter generation storage, which stores 128
characters.

• A continually revolving drum on which a charged
photoconductive surface is selectively discharged
by a low-power laser to produce images of theprinted data
• A developer station where black toner is attracted
to the image• A transfer station where the toner is transferredto the paper forms• A fuser station that fuses the toner into the paper• A cleaning station that removes any residual
toner from the drum after the page has been
printed• A charge station that prepares thephotocond uctor• A forms overlay station that exposes the drumwith form images or other fixed data
Operation
In operation, data to be printed is moved from theprocessor to the 3800 a line at a time, is translated
into graphic code using a set of translate tables, andis stored in the page buffer. When the page buffer
contains a full page, the code is used, throughinteraction with character-generation storage, tomodulate the laser in exposing the revolving drum.
Exposure is by horizontal-line scanning, similar to
the way a cathode-ray gun scans a TV screen to
produce a picture. The image is developed with
toner, transferred to paper, and fused. The
photoconductor surface of the drum is cleaned andconditioned again after each exposure. Finishedcopies are folded again and stacked in thecontinuous forms stacker. Figure 10-14 is aschema~ic diagram of the 3800 printing mechanism.

10-10

IBM Input/Output Device Summary

Fixed Print Data Options
Preprinted forms can be used, or the form image
can be printed simultaneously with text through theuse of a forms overlay negative by character
formatting, or by any combination of these to suitthe application. The forms overlay negative, which
has the image of the form, is installed by theoperator before printing. The image from theoverlay negative can then be printed on any numberof copies, starting with the first. Forms overlay canalso be used for printing pictorial line art, or
halftones, on copies.
Format Modification
The character formatting method uses a character
set working under program control to create a line
image. Copy modification permits the printing ofpredefined data, on specified copies of the pages of adata set. The data can be legends, column headings,
or other information; or it can be blanks to delete
the printing of data. The modification can varyfrom copy to copy.
The overall effect of forms overlay, character
formatting, and copy modification is functionallyequal to the use of conventional numbered,preaddressed, multiple-part forms with standard
features such as legends, spot carbons, short plies,
and printed blockout areas.
Job and Copy Separation Marking
To assist in job and copy separation after processing,identifying marks can be printed on the pageperforations. These two types of separation marks
are the only type of printing allowed within one-halfinch of the horizontal page perforation.

and to intermix these with various character sets
now available for the 3800. A 3800 with theextended graphics feature can process jobs that do
not contain extended graphics data, because thestandard 3800 functions are not affected except fora slight reduction in the page buffer capacity.

Recovery and Status Information
The 3800 has page accounting and configuration
information that is used for recovery and statusactions. Four two-byte (halfword) counters keep
track of the page as it moves from the page buffer
to the stacker.

This feature operates with the Common Use or ISO
size paper and on 50 or 60 hertz machines.
Separate microcode diskettes are used for theextended graphics feature. This feature does not
function with the IBM 3800 tape-to-printing
subsystem feature.

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.

Note: This feature is only available for A/FE

World Trade countries.
127 Writable Character Generation Storage
Positions, Additional

Burster-Trimmer-Stacker
The burster-trimmer-stacker feature bursts printed
output into individ4al sheets with the right and left
carrier strips trimmed off. Jobs or single copies are
separated by offsetting one job or copy from anotherin the stacker, and are ready for distribution without
postprinting delays.

The 127 writable character generation storage
positions, additional feature supplies additional
character-generation storage for 127 characters topermit a maximum print capability of 255 different
characters.

~xtended Graphics

Remote Switch Attachment

The extended graphics feature permits the 3800 toprint characters that are twice the width of standard
characters (that is, a 7.5-pitch in place of two
IS-pitch) as a single extended graphics character,

The remote switch attachment supplies two-channel
switching at a configuration control panel.

Fuser Station
Transfer

Toner
Developer
StationPhotoconductor Supply

""

"

""

~~--qtt?
.
\
M Irror

Laser

Modulator

Figure 10-14. Path of Paper Forms through the 3800 Printing Subsystem
Chapter 10. Printers

10-11

Tape-To-Printing Subsystem Feature
The tape-to-printing subsystem feature permits the3800 to be operated from magnetic tape data. The
printer can be attached to a 3410/3411 Model 3
Magnetic Tape Subsystem or a 3803 Modell or 2
with the 3420 Models 3 through 8 Magnetic Tape
Subsystem. All magnetic tape recording densities
permitted for the magnetic tape subsystem can beused. The configuration can be arranged to let thetape subsystem be used online by supplying aseparate switch able path from the tape control tothe system.
Selection of 3800 functions when the printer is
attached to a magnetic tape subsystem can beaccomplished by three methods: a user-generated
control tape, controls available on the 3800 internal
diskette, or entries at the auxiliary operator panel.
These methods can be used alone, or in combination,to achieve flexible use of the 3800 printing
functions. For example, a control tape may be used
for multiple print jobs, with additional parameters
entered at the auxiliary operator panel for somejobs. Internal diskette controls can be used for otherjobs. A standard set of control tapes can be createdand maintained for use when they are needed.
If control tapes are to be used, the Offline IBM
3800 Utility program (Program Product 5748-UT2)
is available to help the user prepare them. The
utility program operates in an online system
environment. Print selections are specified to theutility program through control statements, and theutility program produces a control tape containing
instructions for printing one or more print data sets.
The tape-to-printing subsystem feature supports all
IBM System/360 and System/370 print tapeformats. Print tape formats generated by
Burroughs. B7000/B6000, Honeywe1l 2 Series 60(level 66/6000), and Sperry Univac 3 1100 Series arealso supported if they are as specified in
Operator/Reference Manual for the IBM 3800
Tape-To-Printing Subsystem Feature.
Two Channel Switch
The two channei switch feature supplies anoperator-controlled two-channel switch, which
permits the 3800 to obtain data from two separate
processors. Automatic switching is supplied by the
dynamic two chaimel switch feature for two
processors sharing main storage, and for twochannels on a single processor.
• Burroughs Corporation, Detroit, Michigan
2 Honeywell Information Systems, Waltham, Massachusetts
3 Sperry Univac, Roseville, Minnesota
10-12

IBM Input/Output Device Summary

3811 Printer Control Unit Modell
The 3811 Printer Control Unit Model 1 is thecontrol unit for the 3211 Printer. The 3811 (Figure10-6) is physically attached to the 3211 andcontains the electronic circuits needed to adapt theprinter to the channel.
The highlights of the 3811 follow.
Attachment to a Processor
The 3811 needs a control unit position on a systemchannel and can attach to a byte multiplexer
channel, block multiplexer channel, multiplexer
channel, or selector channel. The 3811 Control Unit
supplies all the necessary electronic controls andbuffers to adapt the 3211 Printer to the I/O channel
supplied by the processor.
Functional Units
The logic, buffers, and controls for the universal
character set and forms-control buffer are located inthe 3811.

5203 Printer Model 3
The 5203 Pririter Model 3 (Figure 10-15) is a line
printer that prints 10 characters per inch. The
standard 5203 has 96 print positions but can be
expanded through special features to 120 or 132
positions.
The highlights of the 5203 follow.
Attachment to a Processor
The 5203 attaches to an IBM processor equippedwith integrated 5203 printer attachment, thereby
eliminating the need for a separate channel orcontrol unit. Only one 5203 can be attached.
Print Rate
Using the standard 48-character set, the 5203
Printer Model 3 prints 300 lines per minute(maximum) on continuous forms that are
margin-punched and pin-fed.
Forms Size
The individual documents that make up thecontinuous forms can range from 98 to 425 mm(3-7/8 to 16-3/4 in.) in width and from 76 to 356
mm (3 to 14 in.) in length.
Forms Control
The forms control buffer controls the vertical format
and movement (spacing and skipping). The 5203

has vertical line spacing of either 6 or 8 lines perinch that is under operator control.

5213 Printer Model 1
The 5213 Printer Model 1 (Figure 10-16) can
operate as a table-mounted console printer for IBM
processors.
The highlights of the 5213 follow.
Attachment to a Processor
The 5213 attaches to an IBM processor through an
integrated printer attachment.
Printer Characteristics
The 5213 uses a 62-character set and prints seriallyat 85 characters per second. The maximum printline is 132 positions at 10 characters per inch, withline spacing of 6 lines per inch.
Forms

Figure 10-15. IBM 5203 Printer Model 3

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features , see the IBM sales
representative.
Interchangeable Train Cartridge, Additional

The 5213 uses continuous forms that are pin-fed andmargin-punched. The individual documents thatmake up the continuous forms can range from 76 to
356 mm (3 to 14 in .) in length; document width is
352 mm (13-7/8 in.) from left to right of themargin-punched centers. Multiple-part forms can be
printed, having a maximum thickness of 0.457 mm(0.018 in.).
Forms Control
The 5213 has a pin-feed platen and a high-speed
carrier-return. It also has single-space forms
indexing under program control.

The interchangeable train cartridge, additionalfeature supplies an additional operator changeabletrain cartridge that contains from 48 to 120
different characters.
Print Positions, 24, 12, and 36 Additional
The print positions, 24, 12, and 36 additionalfeature increases the number of print positions from96 to 120, from 120 to 132, and from 96 to 132.
Universal Character Set Attachment
The universal character set attachment feature isneeded if any interchangeable train cartridge withmore than 48 different characters is used.

Figure 10-16. IBM 5213 Printer Modell

Chapter 10. Printers

10-13

Data Comparison Table
Figure 10-17 gives a comparison of data for the
printers mentioned in this chapter.

I/O Device
1403

Model

Control Unit

2
7

2821

Nl
1443

Number of
Print Positions

Maximum
Print Speed132

600 lines per
minute120

600 lines per
minute132

1,100 lines per
minutePrint Method

ImpactNl

Internal

120

240· lines per
minute1Integrated

132

600 lines per
minute2

Integrated

132

1,200 lines per
minute

3

3770

132

1,000 lines per
minute4Integrated
Attachment132

1,200 lines per
minute5Internal

132

1,200 lines per
minute

3211

1

3811

132

2,000 lines per
minute

3262

1,2,3

Integrated
Attachment

132

650 lines per
minute132

325 lines per
minute204**

20,040···Nonimpact,
electrophotographic,
laser

3203

11, 12, 13

ImpactImpactImpactImpact3800

1

Internal

5203

3

Integrated
Attachment

96

300 lines per
minuteImpact5213

1

Integrated
Attachment

132

85 characters
per second

Impact, serial,
matrix•1443 Model Nl with 52-character set** 204 positions at 15 characters per inch***3800 with forms length of 279 mm (11 in.) and 12 lines per inch

Figure 10-17. Comparison Data for Printers

10-14

IBM Input/Output Device SummaryChapter 11. Punched Card Devices
The following devices operate on either 80- or 96column cards (Figure 11-1). The punched card canbe used to enter and retrieve data from a processor.
It can also be used for storing data. Payroll checks
are one of the practical applications of these devices.
See Figure 11-11 at the end of this chapter for acomparison of the characteristics of punched card
devices.
Some of these devices have buffers which give theman advantage over the devices that do not. The
buffer is a storage used to compensate for adifference in rate of flow of data, or time ofoccurrence of events, when transferring data fromone device to another.

Speed
The Model Nl reads or punches cards at thefollowing maximum rates:• Reads 400 cards per minute• Punches 160 card columns per second
Punching speed varies with the location of the lastcolumn punched. Interspersed blank columns
between fields are considered pu:nched columns. In
terms of cards per minute, the rated speed forpunching columns 1 through lOis 265; for punchingcolumns 1 through 80 it is 91.
Attachment to a Processor
No external control unit is needed; the control
circuits are inside the 1442. The 1442 Model Nlattaches through a control unit position to a systemchannel. It does not have a buffer.
Hopper and Stackers

80 . Column Card

The read hopper holds 1200 cards. Card movement
is from the hopper to the read station, to the punch
station, then to one of the two stackers (pockets) .
The stackers hold 1300 cards each, and cards can beremoved by the operator from either stacker without
stopping the machine.
Read and Punch Mode
There are two modes of reading and punching cards,
as described below. Data mode 1 is the normal
mode of operation while data mode 2 needs a special
feature called card image.

Figure 11-1. 80- and 96-Column Cards

1442 Card Read Punch Model Nl
The 1442 reads and punches the 80-column card. It
uses a single common card path for reading andpunching, and reads and punches cards serially bycard column. Serial card feeding, past a readstation and then a punch station, makes it possible
for the program to read data from a card and thenpunch data (such as the results of a calculation) into
the same card during a single card pass. The
appearance of the unit is similar to that of the 1442
Model N2 shown in Figure 11-2.
The highlights of the 1442 follow .

Data Mode 1: In data mode 1, the Model Nl canread and punch the 256 different combinations ofholes needed by the extended binary-coded decimal
interchange code (EBCDIC) . For the 256
combinations, multiple punches in a single card
column are needed; however, no more than one
punch is permitted in rows 1 through 7. (Rows 12,
11, 0, 8, and 9 permit 32 possible combinations,which, multiplied by the eight possibilities in rows 1
through 7, equal the needed 256.) For multiple
punches in rows 1 through 7, the card image special
feature is needed.
Data Mode 2: Operations that use the card image
feature are in data mode 2, which is the card image
or column binary mode. The card image feature
permits the low-order six bits of bytes read from the

Chapter II. Punched Card Devices

ll-Iprocessor to be punched alternately into the upper
six and lower six rows of a card, enabling 160 suchtruncated bytes to be placed in the card. In a read
operation, the information is read column by column
and transmitted to the processor byte by byte, thetwo high-order bits (0 and 1) being set to zero.

used for primary card input, often with the 2520
Card Punch Model B2 for maximum
card-processing speeds.

Special Features

The two models of the 2501 (Figure 11-3) areexternally the same, except that the maximum
card-reading rate of the Model Bl is 600 per
minute; that of Model B2 is 1000 per minute.

The following feature can be ordered through the
IBM sales representative to expand and customize
the user's ,operation. More features may beavailable. For more information about features, see
the IBM sales representative.
Card Image
The card image feature permits processing of cards
with mUltiple punches in rows 1 through 7 of asingle column.

1442 Card Punch Model N2
The 1442 Model N2 (Figure 11-2) can be connected
to an IBM processor to supply the card punching
function only. Punching operations, speeds, internal
controls, punching in data mode 2, and all otherfeatures related to punching are the same as thoseof the 1442 Card Read Punch Model N 1, exceptthat the Model N2 has only one 1300-card stacker.

The highlights of the 2501 follow .
Card-Reading Speed

Attachment to a Processor
No external control unit is needed; the control
circuits are inside the device. The 2501 needs acontrol unit position on a system channel. The 2501
does not have a buffer.
Reading Operation
Reading of cards is done by photocells that convert
the light passing through punched holes into
electrical energy. Cards are read serially by column.
The 2501 can read EBCDIC in standard data mode
1. For the 256 combinations in EBCDIC, multiple
punches in a single card column are needed;
however, no more than one punch is permitted inrows 1 through 7. For multiple punches in rows 1
through 7, the card image special feature is needed.
See "Data Mode 2" in the 1442 Model N 1
description earlier in this chapter for a descriptionof the reading operation in card image mode.

Figure 11-2. IBM 1442 Card Punch Model N22501 Card Reader Models Bl and B2
The 2501 is a punched-card input device for an
IBM processor. Model Bl can be used for primarycard input or as a console reader. Model B2 can be
11-2

IBM Input/Output Device Summary

Figure 11-3. IBM 2501 Card Reader

Hopper imd Stacker

Read and Punch Modes

The feed hopper has a 1200-card capacity, andcards can be removed from the single 1300-card
stacker by the operator without stopping the reader.

The following feature can be ordered through the
IBM sale representative to expand or customize theuser's operation. More features may be available.
For more information about features, see the IBM
sales representative.

The 2520 can read and punch EBCDIC in standard
data mode I. For the 256 combinations in
EBCDIC, multiple punches in a single card column
are needed; however, no more than one punch ispermitted in rows 1 through 7. For multiple
punches in rows 1 through 7, the card image special
feature is needed. See " Data Mode 2" in the 1442
Model N 1 description earlier in this chapter for a
description of the reading and punching operations
in card image mode.

Card Image

Hopper and Stackers

The card image feature permits processing of cards
with multiple punches in rows 1 through 7 of asingle column.

The feed hopper has a 1200-card capacity. There
are two stackers. The operator can remove cards
from both l300-card stackers while the machine isrunning.

Special Features

2520 Card Read Punch Model Bl
The 2520 Card Read Punch Model BI (Figure11-4) is a combined punched-card input and output
unit for IBM processors.
The highlights of the 2520 Model BI follow.
Card-Processing Speed
The 2520 Model BI reads and punches cards at a
maximum rate of 500 per minute.
Reading Operation

Special Features
The following feature can be ordered through the
IBM sale representative to expand or customize theuser's operation. More features may be available.
For more information about features , see the IBM
sales representative.
Card Image
The card image feature permits punching of cards
with multiple punches in rows 1 through 7 of asingle column.

Operation of the 2520 Model BI is the same as forthe 1442 Model NI or 2501 with respect to readingcards serially by column. Cards move past a readstation and then past a punch station. Prepunchedcards can be fed through the punch station without
a special feature. As in the 2501, cards are read byphotocells that convert the light passing throughpunched holes into electrical energy. The reading
operations do not go through a buffer.
Punching Operation
The punching operation of the 2520 differs fromthat of the 1442; punching is parallel by row insteadof serially by column. Each card is fed in parallel
and read serially while the preceding card, its axis
turned 90 degrees, is passing by the punch station(Figure 11-5). The 2520 punching operations go
through a buffer.
Attachment to a Processor
No external control unit is needed; the control
circuits are inside the device. The 2520 needs acontrol unit position on a system channel.
Figure 11-4. IBM 2520 Card Read Punch Model Bl

Chapter 1J. Punched Card Devices

11-3Card-Processing Speed

12 Photocells

The 2540 reads cards at a maximum rate of 1000
per minute, and punches cards at a maximum rateof 300 per minute. The card reading and punchingfacilities are separate entities, and can take place
simultaneously.

Parallel
Transport

HopperFigure 11-5. Card Path in the 2520 Card Read Punch
Model Bl

2520 Card Punch Models B2 and B3
The 2520 Card Punch Model B2 or B3 can beconnected to an IBM processor to supply thepunching function only.
The highlights of the 2520 follow .
Card-Punching Speed

Hoppers and Stackers
The read hopper, with its file feed, holds 3100
cards. The punch hopper holds 1350 cards. Five1350-card stackers are located between the read andpunch ends of the 2540; three stackers can be usedin reading and three in punching. The center
stacker can be fed with either punched or readcards, but should be reserved for one or the otherduring a run. The operator can remove cards fromany pocket without stopping the machine.
Attachment to a Processor
The 2540 is controlled and attached to the channel
by a 2821 Control Unit. (See "2821 Control Unit
Models 1, 2, 3, 5, and 6," described under
Chapter 10.)Models B2 and B3 are externally the same (and thesame as the 2520 Model Bl shown in Figure 11-4),
except that the maximum card-punching rate ofModel B2 is 500. per minute; that of Model B3 is
300 per minute.
Similarities to the 2520 Model Bl
Internal controls, punching in data mode 2, thepunching speed of Model B2, and all other features
related to punching are the same as those of the2520 Card Read Punch Model B 1.

Special Features
The following feature can be ordered through the
IBM sales representative to expand or customize theuser's operation. For more information about thisfeature, see the IBM sales representative.
Card Image
The card image feature permits punching of cards
with multiple punches in rows 1 through 7 of asingle column by suspending validity checking.

2540 Card Read Punch Model 1

Figure 11-6. IBM 2540 Card Read Punch

The 2540 Card Read Punch (Figure 11-6) is an
input and output, 80-column card device for an IBM
processor. The 2540 can read and punch EBCDIC.

Special Features

The highlights of the 2540 follow.

11-4

IBM Input/Output Device Summary

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Punch Feed Read
The punch feed read feature permits the 2540 topunch output data into the same card from which
input data was read. Column binary cards cannot
be read in the punch feed. Unless this feature is
installed, only blank cards can be fed through thepunch facility .
Two Channel Switch Adapter
The two channel switch adapter feature permits theread and punch feed of the 2540 to be reset
independently. This is needed if the 2540 is to be
used with a 2821 that has a two channel switch
feature installed.
51-Column Interchangeable Read Feed
The 51-column interchangeable read feed feature
permits feeding either 51-column cards or standard
80-column cards in the read feed of the machine.
The 51 columns are equal to columns 15 through 65
of an 80-column card. (51-column cards can bepostal money orders, installment payments,
inventory cards, for example, a detached 51-column
stub from an 80-column card.) Installation of thisfeature permanently reduces the maximum
card-reading speed to 800 cards per minute. The
first two read pockets are modified so that theoperator can adjust for either an 80- or 51-column

operation. During the time that the pockets are set
for 51-column cards, the capacity of the two pockets
is reduced to 800 cards each and 80-column cards
cannot be fed.

2560 Multi-Function Card Machine
Models At and A2
The 2560 Multi-Function Card Machine (Figure11-7) supplies the combined functions of a card
reader, card punch, and card collator for an IBM
processor. The 2560 permits cards to be collated,
gangpunched, reproduced, summary punched, andclassified in a single pass, under program control.
There are two models of the 2560:• Model A 1 reads 500 cards per minute fromeither of two hoppers, punches at 160 columns
per second, prints at 140 columns per second, andhas five stackers.
• Model A2 reads at 310 cards per minute fromeither of two hoppers, punches at 120 columns
per second, and has four stackers.
The highlights of the 2560 follow.
Attachment to a Processor
The 2560 attaches to an IBM processor through an
integrated attachment.

Figure 11-7. mM 2560 Multi-Function Card Machine
Chapter 11. Punched Card Devices

11-5Functional Units

It is available in two models:

Both models have two 1200-card hoppers (primaryand secondary), a read station, a punch station, andfour or five 1300-card stackers.

• Model Al reads 800 cards per minute.

Read and Punch Operations• Model A2 reads 1200 cards per minute.
The highlights,of the 3504 follow.
Functional Units

Cards from either the primary or secondary hopper
can be read, punched, and fed into any of thestackers. While in the read station, cards arechecked for data validity, off-register punching, andcorrect alignment. The output per minute varies
with the number of columns punched per card. For
example, the output rates for Models Al and A2vary from 91 and 65 cards per minute respectively
when column 80 is the last column punched, to 260
and 173 cards per minute respectively whenpunching stops at column 10.

Special Features
The following feature can be ordered through the
IBM sales representative to expand or customize theuser's operation. For more information about thisfeature, see the IBM sales representative.
Card Print
The card print feature (Model Al only) supplies
two, four, or six printing heads for serial printing as
the card moves through the print station. Eachprinting head can be adjusted by hand to print inanyone of 25 line positions not occupied by anotherhead. Line positions are above the 12-punch
position, on each row of punch positions, between
the rows of punch positions, and below the 9-punch
position.
Each printing head can print 62 different charactersplus a blank, as transmitted from storage.
Character spacing is 10 to the inch, and each line
can be 64 characters long. Printing extends fromapproximately column 2 to column 75.

The 3504 Card Reader (Figure 11-8) is ahigh-speed device, that has 3000-card file feed andtwo 1750-card nonprogrammable stackers.
Attachment to a Processor
The 3504 attaches to an IBM processor through anin tegra ted a ttachmen t.
Error-Recovery Support
The 3504 needs less error-recovery support than I/O
devices such as the 2540 Card Read Punch, because
many of the functions performed by the programsupport are already performed by the 3504 (forexample, automatic feed retry).
The 3504 also has error-retry capabilities: It retries
cards that fail to feed on the first try, and signals ahopper misfeed if subsequent retry operations are
unsuccessful.
Operator Panel
The 3504 has a recovery-oriented operator panel.
The indicators on the panel show the precise action
to be performed for all normal stops and most error
stops, or they direct the operator to a corrective
procedure. Operating keys ar~ located in the samegeneral area for ease of control.
Read Column Eliminate
The read column eliminate capability gives the user,
under program control, the ability to suppress thereading of selected card columns and substitutes
blanks in these columns in the buffer.

Printing speed is 140 characters per second,
regardless of the number of lines printed. Six
hundred 64-character lines per minute (100 cards
per minute) can be printed if six lines are printed oneach card; this time includes card movement andregistration.

Read and Validity Checks

The card print feature permits cards to be printed(interpreted) in the same pass with other operations.

Special Features

3504 Card Reader Models At and A2
The 3504 Card Reader supplies an 80-column,
punched-card, input unit for an IBM processor.

11-6

IBM Input/Output Device Summary

Card reading in a 3504 is serially by column. The
card read is checked for invalid codes oropen-punched card scores. Machine checks are also
made for off-punched or mispositioned cards.

The following features can be ordered through the
IBM sales representative to expand and customize
the user's operation. The list of features may not becomplete and more may be available. For more
information a~out features, see the IBM sales
representa tive.

51/80-Column Interchangeable Read Feed

Error Recovery Support

The 51/80-column interchangeable read feed feature
gives the attachments necessary to feed and read
51-column cards.

The 3505 needs less error-recovery support thanother I/O devices such as the 2540 Card Read
Punch, because many of the functions performed by
the program support are already performed by the3505 (for example, automatic feed retry).

Optical Mark Read
The optical mark read feature permits the 3504 toread up to 40 columns of marked data.
Pencil-marked, machine-printed,
nonreflective-marked, and punched data can be readfrom a card.
Selective Stacker
The selective stacker feature supplies a third stacker(second logical stacker) , which permits
time-independent card selection under program
control.

3505 Card Reader Models Bl and B2

The 3505 has error-retry capabilities: It retries
cards that fail to feed on the first try, and signals ahopper misfeed if subsequent retry operations are
unsuccessful.
Operator Panel
The 3505 has a recovery-oriented operator panel.
The indicators on the panel show the precise action
to be performed for all normal stops and most error
stops, or they direct the operator to a corrective
procedure. Operating keys are located in the samegeneral area for ease of control.
Read Column Eliminate

The 3505 Card Reader Models Bl and B2 (Figure11-8) is an 80-column, punched-card, input device
for an IBM processor. It is a high-speed, fully
buffered, card reader, containing its own control
unit.

The read column eliminate capability gives the user,
under program control, the ability to suppress thereading of selected card columns and substitutes
blanks in these columns in the buffer.

The 3505 is available in two models:

Read and Validity Checks• Model B 1 has a rated card speed of 800 cards
per minute.

Card reading in a 3505 is serially by column. The
card read is checked for invalid codes oropen-punched card scores. Machine checks are also
made for off-punched or mispositioned cards.

• Model B2 has a rated card speed of 1200 cards
per minute.
The highlights of the 3505 follow.
Attachment to a Processor
The 3505 needs a control unit position on a systemchannel.
File Feed and Stackers
Both models of the 3505 have a 3000-card capacity
file feed and two 1750-card capacity stackers.
Control Unit
The control unit with buffers, housed within the3505:• Contains its own microprocessor' and resident
programs (microcode) for error detection andrecovery assistance• Keeps a log of recent errors (especially helpful indevice maintenance)• Prevents channel overrun• Permits card data to be transferred in burst mode

Figure 11-8. IBM 3504 or 3505 Card Reader

Chapter 11. Punched Card Devices

11-7

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representative.
Optical Mark Read

The 3525 has three models:• Model PI has a rated speed of 100 cards per
minute.
• Model P2 has a rated speed of 200 cards per
minute.
• Model P3 has a rated speed of 300 cards per
minute.
The highlights of the 3525 follow.

The optical mark read feature permits the 3505 toread up to 40 columns of marked data.
Pencil-marked, machine-printed,
nonreflective-marked, and punched data can be readfrom a card.

The 3525 attaches to an IBM processor through the3505 or through an integrated attachment. It needs
a control unit position on a system channel.

Selective Stacker

Functional Units

The selective stacker feature supplies a third stacker(second logical stacker), which permits
time-independent card selection under program
control.

The 3525 has a 1200-card capacity hopper and two
1200-card capacity stacker.

3525 Card Print Control

The 3525 needs less error-recovery support thanother I/O devices such as the 2540 Card Read
Punch, because many of the functions performed by
the program support are already performed by the3525 (for example, automatic punch retry).

The 3525 card print control feature supplies thecontrol necessary for the basic card print feature
installed on the 3525.
3525 Punch Adapter
The 3525 punch adapter feature permits attachmentof the 3525 Card Punch, without its card readfeature.
3525 Read Punch Adapter
The 3525 read punch adapter feature permits
attachment of the 3525 Card Punch that has thecard read feature installed.
51/80-Column Interchangeable Read Feed
The 51/80-column interchangeable read feed feature
permits feeding either 51-column cards or standard
80-column cards in the read feed of the machine.
The 51 columns are equal to columns 15 through 65
of an 80-column card.

3525 Card Punch Models PI, P2,
and P3
The 3525 Card Punch (Figure 11-9) is an
80-column, punched-card, output device. Whenequipped with the appropriate special features, it
can read and print as well as punch 80-column
cards in a single pass through the machine.

11-8

IBM Input/Output Device Summary

Attachment to a Processor

Error-Recovery Support

On recognizing a card with a punch error, the 3525
sends that card to an error stacker for later
examination and retries correct punching.
Operator Panel
The 3525 has a recovery-oriented operator panel.
The indicators on the panel show the precise action
to be performed for all normal stops and most error
stops, or they direct the operator to a corrective
procedure. Operating keys are located in the samegeneral area for ease of control.
Punch Checking
The 3525 checks card punching by monitoring the
movement of all 80 punches. A card in which apunching error is sensed is automatically directed toa dedicated, 200-card capacity error stacker andfollowed by two automatic punching retry
operations. Either the extended binary-coded
decimal interchange code or card image can bepunched.

5425 Multi-Function Card Unit
Models At and A2
The 5425 Multi-Function Card Unit (Figure 11-10)
is a 96-column punched-card device for an IBM
processor. It can function as a card reader, card
punch, collator, and interpreter. The consolidationof these functions into one unit reduces card
handling and the overall time to complete a job. In
a single pass and under program control, the 5425
permits 96-column cards (Figure 11-1) to becollated, gangpunched, reproduced,
summary-punched, printed, and classified. It alsosorts cards, using a multiple pass method underprogram control.
Externally, both models of the 5425 look the same,and both have two 2000-card hoppers, a readstation, a punch station, a print station, and four
600-card stackers; the exceptions are:Figure 11-9. IBM 3525 Card Punch

Special Features
The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
rep res en ta tive.
Card Read
The card read feature supplies an opticalhole-sensing station ahead of the punch station. The
cards are read parallel by row. This feature permits
the 3525 to read 3504 and 3505 program cards andexecute the program. The read column eliminate
capability is standard with this feature and gives theability, under program control, to suppress thereading of selected card columns.
Multiline Card Print
The multiline card print feature gives the ability toprint, under program control, on any or all of the 25
printing lines on a card.
Two-Line Card Print
The two-line card print feature is the same infunction as the multiline card print, with the
exception that printing is limited to lines 1 and 3.
Maximum speed in cards per minute, when printing,varies with the machine model only.

• Model Al reads 250 cards per minute, punches
60 cards per minute, and prints 60 cards per
minute.
• Model A2 reads 500 cards per minute, punches
120 cards per minute, and prints 120 cards per
minute.
These print rates are for the first, second, and thirdlines, but they are reduced if the fourth line isprinted.
The highlights of the 5425 follow.
Attachment to a Processor
The 5425 attaches to an IBM processor through an
integrated attachment.
Card Path
The primary and secondary hoppers feed cards
through the read station into wait stations. From
the wait stations, the cards pass through the punch
station and the print station, and move into aselected stacker.
Printing
At the print station, up to four lines (with as manyas 32 characters per line) can be printed, using
characters from the standard 64-character set.

Chapter 11. Punched Card Devices

11-9

~5425Figure 11-10. IBM 5425 Multi-Function Card Unit with System/370 Model 115

11-10

IBM Input/Output Device Summary

Data Comparison Table
Figure 11-11 gives a comparison of data for thecard devices mentioned in this chapter.

Read and
Punch Same
Card in One
Pass

Self-Contained
Control Unit

Buffers

yes

none
none

Card Unit

Model

Read Speed (cards
per minute)

1442

Nl

400

160 eels(see Note 3)

yes

1442

N2

-

160 cc/s(see Note 3)

-

yes

2501

Bl

600

-

-

y_es

none

2501

B2

1,000

-

-

yes

none

2520

Bl

500

500 ciJn

y_es

yes

J)unch-500 c/m

-

yes

punch

300 clm

-

yes

~nch

Punch Speed

2520

B2

2520

B3

2540

1

1,000
(see Note 1)

300 c/myesnoread, punch

2560

Al

500

160 eels(see Note 4)

yes

no

none

2560

A2

310

120 eels(see Note 5)

yes

no

none

3504

Al

800

3504

A2

1,200

-

3505

Bl

800

3505

B2

1,200

3525

PI

100
(see Note 2)

3525

P2

3525

-

no

read

-

no

read

-

-

yes

read

-

-

yes

read

100 c/myesnoread, punch, print

200(see Note 2)

200 c/myesnoread, punch, print

P3

300(see Note 2)

300 c/myesnoread, punch, print

5425

Al

250

60 c/m

yes

no

none

5425

A2

500

120 c/m

yes

no

none

Notes:
1. 800 if the 51180-column interchangeable read feed feature is installed.
2. With the card read feature installed.
3. 265 cards per minute if the unit punches columns 1 through 10; 91 cards per minute if it punches all 80 columns.
4. 260 cards per minute if the unit punches columns 1 through 10,· 91 cards per minute if it punches all 80 columns.
5. 173 cards per minute if the unit punches columns 1 through 10,· 65 cards per minute if it punches all 80 columns.
Legend:cc/s - card columns per second
c/m - cards per minute

Figure 11-11. Comparison Data for Card Devices

Chapter 11. Punched Card Devices

11-11Chapter 12. Punched Tape Devices
The punched tape devices use paper tape to enter
data into a processor. The tape can be 11/ 16-inch(five-track telegraphic code), I-inch (eight-trackcode), or 7/8-inch (six- and seven-track codes) wide.

2671 Paper Tape Reader
2671

The 2671 Paper Tape Reader (Figure 12-1) is an
input unit for an IBM processor. It is especiallydesigned for data communication, source recording,scientific data processing, and data gathering.
The highlights of the 2671 follow .
Read Operation

2822

The 2671 photo-electrically reads strips of 5-, 6-, 7-,
or 8-channel paper tape at a rate of up to 1000
characters per second. After acceleration time
(approximately 8 milliseconds), the data rate
reaches 1000 characters per second for strips. Withspooling facilities, this rate can vary between 500
and 1000 characters per second, as determined by
the length of a record.
Tape width is 17.5 mm (11/16 in.) (for five-track
telegraphic code), 22.2 mm (7/8 in.) (six- andseven-track codes) , or 1 inch (25.4 mm) (eight-trackcode).

Figure 12-1. IBM 2671 Paper Tape Reader and IBM
2822 Paper Tape Reader Control

The basic 2671 reads strips of paper tape from 229
mm to 6.10 m (9 in. to 20 ft) in length, including a152.4 mm (6 in.) leader and 76 mm (3 in.) trailer.
Tape code translation is under program control.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features, see the IBM sales
representa tive.

Operator Panel
Various switches on the 2671 panel aid operator
functions and contribute to program efficiency.
Examples are: end-of-record indications, parity
checking (odd, even, or none), track suppression,and transmission or non transmission to the processorof indications about deleted positions on tape.
Attachment to a Processor
The 2671 and the 2822 Paper Tape Reader Control(Figure 12-1) are usually attached to an IBM
processor through a byte multiplexer channel, butthey can be attached to another channel on someprocessors.

Special Features

Center Roll Feeding
Spooling facilities are optional. The center rollfeeding feature permits the 2671 to feed tape fromthe center of 266.7 mm (10.5 in.) rolls.
Supply Option
The supply option feature permits the 2671 to feed
tape from a 266.7 mm (10.5 in.) reel (tape is fed
from the outside of the reel).
Take-Up Option
The take-up option feature permits the 2671 to
rewind tape on 266.7 mm (10.5 in.) reels.

Chapter 12. Punched Tape Devices

12-12822 Paper Tape Reader Control
The 2822 Paper Tape Reader is the control unit forthe 2671 Paper Tape Reader and is usually attached
to an IBM processor through a byte multiplexer
channel, but can be attached to another channel onsome processors.

12-2

IBM Input/Output Device Summary

Functional Units
The 2822 supplies status and data information fromthe 2671 to the processor. It also checks for parity
and signals the end of record and the end of tape.

Chapter 13. Systems
The systems described in this chapter interact with
IBM processors to pass data from or to the systemthrough the processor's channel or integrated
attachment.

3250 Graphics Display System
The 3250 Graphics Display System (Figure 13-1)
supplies interactive graphics capabilities for its hostsystem. Graphic and alphameric information isdisplayed on a cathode-ray tube. Two types ofkeyboard and a light pen can be installed to permit
the operator to interact with the displayed image
and the host system, and to update stored data.
Figure 13-4 illustrates the configuration of a 3250
System. Further introductory information and thedetails of attachment to a host system are containedin An Introduction to the IBM 3250 Graphics
Display System.
Interactive computer graphics are used in a large
and still growing variety of applications. Some of
the most complex and highly developed applications
are found in the automotive and aerospaceindustries, in which complete geometric definitionsof products are specified through interactive graphic
displays linked to powerful processors. Other
industries that use interactive computer graphics
include shipbuilding, electronics, architecture, andgeneral mechanical engineering.

A key characteristic of these applications is thelarge am9unt of operator-initiated interactions withthe system through input devices and the displayed
graphic information. Rapid interaction with large
amount of graphic and alphameric data is thenormal mode of operation.
Several logically distinct and important functions
contribute to the value of an application:• Entering and editing data
• Updating and controlling changes• Modeling geometric designs• Sending data to other functions
The importance of these functions varies from one
application to another. In some applications, such as
integrated circuit layout or precision mapping, data
entry and editing are important because large
amount of precise data must be accurately
generated. In other applications, such as
computer-aided design engineering, change control
can be important.
The highlights of the 3250 follow.
Image Display
Information can be presented graphically (graphs ormaps) and alphamerically (descriptive data). The

Figure 13-1. IBM 3250 Graphics Display System
Chapter 13. Systems

13-1

images appear as a series of points, lines, andcharacters, and can be readily modified by the entryof additional information. Lines are displayed in oneof four types of lines: solid, dotted, dashed, or
dot-dashed. Each element of the image can bedisplayed at one of eight programmable intensity
levels.

keyboard, a program function keyboard, and a light
pen through the installation of special features.

2250 Program Compatibility
The 3250 is generally upward compatible from the2250 Graphic Display Unit Model 3. Valid
programs written for the 2250 can be used on the3250 without change, with the following minor
exceptions:• The 3250 supports one cursor per display station.
• Some earlier undefined orders have a defined
function in the 3250.
• Lowercase characters are displayed as lowercaseby the 3250.
• The 3250 does not have Program Function
Keyboard overlay sense switches.
• The 3250 shares display buffers with a maximumof two display stations.
• Undefined characters in 3250 text strings aretreated as blanks or nulls.
Channel Attachment
The 3250 Graphics Display System attaches to ahost system through an I/O channel (Figure 13-4).
This attachment gives two-way communication
between the units of the 3250 system and thegraphics application program. The 3250 system canbe attached to any of the following types of I/Ochannel:• Byte multiplexer channel operating in burst
mode.
Note: The IBM System/370 Models 115 and 125
are not supported by OS/VS.
• Block multiplexer channel.
• Selector channel.
Units of the 3250 Graphics Display Systemcomponents follow .

3251 Display Station. The 3251 Display Station (Figure 13-2) is afree-standing, table-top-mounted, interactive CRT
display station for the input and display of graphic
and alphameric data generated in an IBM processor.
The display station can have an alphanumeric

13-2

IBM Input/Output Device Summary

Figure 13-2. IBM 3251 Display Station

3255 Display Control Unit
The 3255 Display Control Unit (Figure 13-3) is afree-standing, floor-mounted unit that supplies
common controls and attachments for one or two
3251. The 3255 has a 32,768-byteuser-programmable display buffer that is shared by
the attached 3251s. If the 3250 uses only one
display station, that display can use the entire
display buffer.
The logic circuits in the 3255:• Accept data from, and pass data to, the serial
link to the 3258
• Maintain and execute a buffer program for eachattached 3251
• Generate the beam deflection and intensity
signals for producing the image on the screen ofeach attached 3251
• Supply a light pen interface for each attached3251• Supply a keyboard interface for each attached3251• Supply an interface between the buffer programs
and, through the 3258 Control Unit, the hostsystemDisplay Buffer: In the 3255, a 32,768 byte buffer
is available to the buffer programs controlling theattached 3251s. Buffer programs are created andupdated by the application program in the hostsystem. The programs are then sent to the 3255
through the 3258 and the serial link. The functionsof the buffer program are to generate the display
image and to monitor the keyboards and light pen to
accept operator actions.
The buffer programs consist of graphic orders,graphic and alphameric data, and control orders,which control:

The 3258 is a channel-attached control unit that
supplies an interface between the connected 3255
Display Control and the channel of the host system.
Up to four 3255 Display Control Units can be
attached to the 3258 through individual coaxial linksof 1 megabit per second. These links can be up to1525 m (5000 ft) in length (longer by request for
price quotation [RPQ]) for local attachment. In
addition, RPQs are available that permit remoteconnection of 3255s to a 3258 throughcommunication systems. These systems permit
display stations to be placed far from the central
data-processing complex.

• Regeneration of the displayed image• The sensitivity of the displayed image to a light
pen operation

I/ O Channel ~• Data entry from the alphanumeric keyboard

3258 Control Unit
The 3258 Control Unit (Figure 13-3) is afree-standing, floor-mounted unit that attaches a3250 System to a standard System/370 block
multiplexer, selector, or byte multiplexer (burstmode) channel interface. The 3258 supports a burst
mode data rate of up to 250,000 bytes per second,
when the rate is not limited by the channel datarate.

IBM 3258 Contro l Unit

IBM 3255 Di splay Contro l(Maxim um of fo ur per 3258 Un it)

IBM 325 1 D isplay Station(Maximum of two per 3255)

Program Fun ction Keyboard

Figure 13-4. Simplified Configuration of a 3250 System

3270 Information Display System

Figure 13-3. IBM 3255 Display Control Unit or IBM
3258 Control Unit

The 3270 Information Display System (Figure 13-5)
is composed of units and features selected from afamily of display products. A combination of
products can be selected and tailored to meet theneeds of most alphameric and graphic display
applications.

Chapter 13. Systems

13-3

The highlights of the 3270 follow .
System Configuration
The 3270 Information Display System has
configuration flexibility . It consists of a control unit
and a cluster of up to 32 units, which can include:• Display stations, whose display capabilities varyfrom 480 to 3564 characters• Two types of printers:- Matrix printers with a maximum print rate of
120 characters per second- Line printers with a maximum print rate of
400 lines per minute
The 3270 can be attached locally (directly to a hostsystem channel), or it can be attached remotely to ahost system. Only local channel attachment is
described in this publication. Remote attachment is
described in IBM Data Communication Device
Summary.

3272 Control Unit (Local Attachment)
Models 1 and 2
Local (direct) attachment of a 3272 Control Unit
Model 1 or 2 to an IBM processor is through aselector, multiplexer, or block multiplexer channel.
The 3272 Control Unit permits the attachment of
up to four devices at a data transfer rate of up to

650,000 characters per second. With special
features installed, it can control the operation of up
to 32 attached units.
Modell has a 480-character buffer capacity; Model
2 has a I920-character buffer capacity.

3274 Control Unit Models lA, IB, and ID
The 3274 cluster control unit can control up to 32
display stations and printers. Three models supply
local channel attachment:• Model IA attaches to the processor through aselector, multiplexer, or block multiplexer channel
for local (SNA version) mode of operation.
• Models 1Band 1D attach to the processor
through a selector, multiplexer, or block
multiplexer channel for local 3272 version(non-SNA) mode of operation.
Customized System Diskette: As part of the 3274
installation procedure, a customized system disketteis generated. The generation process is done by thecustomer at installation time by inserting diskettes
in the 3274 and keying in system configuration
parameters at a 3278 or 3279 display station
attached to the 3274. The customized systemdiskette can be duplicated, or it can be regenerated
to reflect configuration data that is changed.

Terminals

Control Unit

Figure 13-5. IBM 3270 Information Display System-Line Printer, Display Terminals, and Control Unit
13-4

IBM Input/Output Device Summary

Types of Terminal Adapters: Terminals that can
attach to the 3274 are attached to two types ofterminal adapters: Type A and Type B. The TypeA adapter can attach Category A terminals, and theType B can attach Category B terminals, as follows:• Category A Terminals: 3278 Display Stations,
3279 Color Display Stations, 3287 Printer, and3289 Line Printers• Category B Terminals: 3277 Display Stations,3284 Printers, 3286 Printers, 3287 Printers, and
3288 Line Printers3277 Display Station Models 1 and 2
The 3277 Display Station is a cathode-ray tube
display station used in clusters with a control unit
for displaying alphameric data, and for entering andretrieving data. This display station (Figure 13-6)
can display up to 1920 characters per screen display.
The 3277 attaches up to 610 m (2000 ft) cable
length from the control unit.
Models 1 and 2 are have the following
characteristics:• Modell displays 480 characters and attaches toa 3272 Control Unit (all models) or to a 3274
Control Unit (all models) with a Type B terminal
adapter installed.
• Model 2 displays 1920 characters and attaches toa 3272 Control Unit Model 2, or to a 3274
Control Unit (all models) with a Type B terminal
adapter installed.

to indicate certain conditions. The 3278 attaches up
to 1500 m (4920 ft) cable length from the 3272 or
3274 Control Units.
The 3278 has five models:• Model 1 displays 960 characters (12 lines of 80
characters) .
• Model 2 displays 1920 characters (24 lines of 80
characters) .
• Model 3 displays 2560 characters (32 lines of 80
characters)• Model 4 displays 3440 characters (43 lines of 80
characters) .
• Model 5 displays 3564 characters (27 lines of 132
characters).
When it operates in 3277-compatible format, the3278 Modell displays 480 characters (40characters per line), and Models 2, 3, 4, and 5
display 1920 characters (80 characters per line).
Control Unit Attachment: Only Models I, 2, 3, and4 can attach to Type A terminal adapters on allmodels of the 3274 Control Unit. Model 5 can
attach only to Type A terminal adapters on the3274 Models lA and ID.
Programmed Symbols (PS): The 3278 (except
Models 1 and 5), when attached to a 3274 ModellA or ID with Configuration Support C, cansupport programmed symbols (PS) and graphics.
Extended Highlighting: The 3278, when attached toa 3274 Model lA or ID with Configuration Support
C, can support extended highlighting (underscore,
blink, and reverse video).
Switch Control Unit: The 3278 can be equippedwith the switch control unit feature, which permitschanging the display station between two control
units.

Figure 13-6. IBM 3277 Display Station Model 23278 Display Station Models 1 through 5
The 3278 Display Station (Figure 13-7) displays up
to 3564 characters per screen display. An operator
information area is supplied at the bottom of thescreen, in which operator messages can be displayed

Chapter 13. Systems\3-5

Figure 13-8. IBM 3279 Color Display Station
Figure 13-7. IBM 3278 Display Station

3284 Printer Models 1 and 23279 Color Display Station Models 2A,
2B, 3A, and 3B

The 3284 Printer (Figure 13-9) is a floor-standing
matrix printer with a maximum print rate· of 40
characters per second. Models 1 and 2 can attach
up to 610 m (2000 ft) cable length from the control
unit.

The 3279 Color Display Station (Figure 13-8)
displays up to 2560 characters per screen display.
An operator information area is supplied at thebottom of the screen, in which operator messages
can be displayed to indicate certain conditions.
The 3279 is available in four models:• Models 2A and 2B display 1920 characters (24lines of 80 characters).
• Models 3A and 3B display 2560 characters (32lines of 80 characters) .
When it operates in 3277-compatible format, the3279 displays 1920 characters (80 characters perline) .
Switch Control Unit: The 3279 can be equippedwith the switch control unit feature, which permits
the display station to be controlled by either of twocontrol units.
Control Unit Attachment: The 3279 attaches to the3274 Control Unit Models lA, IB, and ID for basecolor (four-color on a field basis) operation. It
attaches up to 1500 m (4920 ft) cable length fromthe 3274. The 3279 Models 2B and 3B, when
attached to a 3274 Model lA or 1D with
Configuration Support C, can support the following:

Models 1 and 2 have the following characteristics:• Model 1 has a 480-character buffer capacity andattaches to a 3272 Control Unit (all models) or
to a 3274 Control Unit (all models) with a TypeB terminal adapter installed.
• Model 2 has a 1920-character buffer capacity
and attaches to a 3272 Control Unit Model 2 or
to a 3274 Control Unit (all models) with a TypeB terminal adapter installed.

3286 Printer Models 1 and 2
The 3286 Printer (Figure 13-9) is a floor-standing
serial matrix printer with a maximum print rate· of
66 characters per second. Models 1 and 2 canattach up to 610 m (2,000 ft) cable length from thecontrol unit.
Models 1 and 2 have the following characteristics:• Model 1 has a 480-character buffer capacity andattaches to a 3272 Control Unit (all models) or
to a 3274 Control Unit (all models) with a TypeB terminal adapter.

• Extended color (seven-color on a character orfield basis) operation• Extended highlighting (underscore, blink, andreverse video)• Programmed symbols (PS) and graphics
13-6

IBM Input/Output Device Summary• Actual printer throughput varies with the operational andsystem characteristics. Factors such as control-unit
configuration, line-transmission rate, output format, buffer
sizes, character set, and program-application processing must
be considered in determining throughput.

• Model 2 has a 1920-character buffer capacity
and attaches to a 3272 Control Unit Model 2 or
to a 3274 Control Unit (all models) with a TypeB terminal adapter installed.

Control Unit Attachment: The 3287 attaches toeither the 3272 or 3274 Control Unit. It attaches up
to 1500 m (4920 ft) cable length from the 3274
Type A terminal adapter, or up to 610 m (2000 ft)
cable length from the 3272 Control Unit or 3274
Type B terminal adapter, as follows:• The 3287 Models 1 and 2 attach to either a TypeA or Type B terminal adapter on the 3274
Control Unit, based upon the 3287 attachment
feature selected. The 3287 Models lC and 2C
attach only to a Type A terminal adapter.

Figure 13-9. IBM 3284 Models 1 and 2 or IBM 3286
Printer Models 1 and 23287 Printer Models 1, lC, 2, and 2C
The 3287 Printer (Figure 13-10) is a table-top
matrix printer with bidirectional printing capability.

• The 3287, when attached to a 3274 Model lA or
ID with Configuration Support C, supports
extended highlighting (underscore only) andprogrammed symbols (PS) and graphics.
Note: The application used maya/so reduce thethroughput of the 3287 when the 3287 prints
using PS.
• The 3287 Models lC and 2C, when attached to a3274 Model IA or ID with Configuration
Support C, supports four-color mode printing ona character or field basis.

The four models indicate the print rate· and color
capabilities, as follows:• Model I has a maximum print rate of 80
characters per second and prints in monochromemode.
• Model 2 has a maximum print rate of 120
characters per second and prints in monochromemode.
• Model I C has a maximum print rate of 80
characters per second when printing inmonochrome mode. It can also print in four-colormode.
• Model 2C has a maximum print rate of 120
characters per second when printing inmonochrome mode. It can also print in four-color
mode.
Models I, I C, 2, and 2C have a 1968-character
buffer capacity. An additional 2048 bytes of buffer
is available for printouts of 2560, 3440, or 3564
characters.
Printed Output in Four-Color Mode: The
throughput of the 3287 Models I C and 2C may be
reduced when they print in color mode, because theprint head must make a separate pass for each color
used on a given line. Character positions 1 through120 can print in four-color or monochrome mode;character positions 121 through 132 can print onlyin black.

Figure 13-10. IBM 3287 Printer3288 Line Printer Model 2
The 3288 Line Printer (Figure 13-11) is afloor-standing line printer with a maximum print
rate· of 120 lines per minute. The print rate is up
to 80 lines per minute when the text print feature is
installed.

• Actual printer throughput varies with the operational andsystem characteristics. Factors such as control-unit
configuration, line-transmission rate, output format, buffer
sizes, character set, and program-application processing must
be considered in determining throughput.
Chap~er 13. Systems

13-7

Control Unit Attachment: The 3288 Model 2 has a
1920-character buffer capacity and attaches to a
3272 Control Unit Model 2 or to a 3274 Control
Unit (all models) with a Type B terminal adapter
installed. It attaches up to 610 m (2000 ft) cable
length from the control unit.

Figure 13-12. IBM 3289 Line PrinterSpecial Features
Figure 13-11. IBM 3288 Line Printer Model 23289 Line Printer Models 1 and 2
The 3289 (Figure 13-12) is a floor-standing line
printer with an integral forms stand/stacker.
The two models indicate the print rates·, as follows:• Model 1 has a maximum print rate of 155 lines
per minute.
• Model 2 has a maximum print rate of 400 lines
per minute.
Models 1 and 2 have a 4016-character buffer
capacity.

The following features can be ordered through the
IBM sales representative to expand or customize theuser's operation. The list of features may not becomplete and more may be available. For more
information about features , see the IBM sales
representative.
APL and Text
The APL and text feature is available to the 3278
Display Station Models 1 through 5; to the 3279
Color Display Station Models 2B and 3B; and to the3278 Printer Models 1 and 2 when they areattached to the 3274 Control Unit Models lA and
ID.
Color Display

Control Unit Attachment: The 3289 attaches to the3274 Control Unit (Type A terminal adapter only).
It attaches up to 1500 m (4920 ft) cable lengthfrom the 3274.

The color display feature supports the 3279 Color
Display Station and the 3287 Printer Models lC
and 2C.
Data Analysis-APL Feature
The data analysis-APL feature supplies the user
with an interactive APL or text capability.
Data Security Features• Actual printer throughput varies with the operational andsystem characteristics. Factors such as control-unit
configuration, line-transmission rate, output format, buffer
sizes, character set, and program-application processing must
be considered in determining throughput.
13-8

IBM Input/Output Device Summary

Data security features, such as security keylock andoperator identification card reader or magnetic slot
reader, permit the entering of data from badges, ID
cards, and other magnetic striped plastic cards.

Extended Highlighting

The major components of the 3730 follow.

The extended highlighting feature (underscore,
blink, and reverse video) is available to the 3278
Display Station and to the 3279 Color Display
Station.

3732 Text Display Station

Keyboards
Typewriter, data entry, APL, text, attribute select,overlay, and operator console keyboards areavailable.
Magnetic Slot Reader and Magnetic Hand Scanner
The magnetic slot reader and magnetic handscanner features permit the entry of magneticallyencoded data into the system.

The 3732 Text Display Station (Figure 13-13)
includes a 1920-character display and special
feature keyboard. The display is a 15-inch(diagonal) cathode-ray tube that supplies 24 lines of
80 characters each. The top and bottom lines arereserved for system use, which leaves 22 lines
available for text entry. The keyboard contains acentral text-entry section that is similar in layout toa typewriter keyboard. In addition, the keyboard
contains 29 function and control keys.

Programmed Symbols (PS) and Graphic
The programmed symbols (PS) and graphic features
are available to the 3278 Display Station (except
Models 1 and 5); to the 3279 Color Display Station;and to the 3287 Printer. The programmed symbols
feature permits the customer to define, store, haveaccess to, display, and print symbols and special
characters.
Selector Light Pen
The selector light pen feature supplies a hand-held,
pen-like device that permits an operator of a display
station to select fields of data from the display
screen for input to the host system.
For details about configurations and features, see
Chapter 2 of IBM 3270 Information Display
System Configurator.

3730 Distributed OfficeCommunication System
The 3730 Distributed Office Communication System
is a distributed text processing system built aroundthe 3791 Controller Models 11 C, 12A, or 12B. The
system supplies functions for document creation,
editing, storage, retrieval, and printing. It canoperate as a stand-alone system, as a host-attachedsystem, or as a concurrent 3730-3790 system. The
concurrent 3730-3790 system can operate as astand-alone unit or attached to a host system.

Figure 13-13. IBM 3732 Text Display Station

3736 PrinterThe 3736 Printer (Figure 13-14) is a bidirectional,
serial-impact printer that prints on single sheets (cutforms) or on continuous forms . It has the following
characteristics:• Printing of up to 55 characters per second• Printing at 6 lines per inch (when using
single-line spacing)• Interchangeable 96-character print wheels, withfour available type styles

Chapter 13. Systems

13-9

The 3791 can be connected in one of two ways to ahost system:• Directly (locally), using a 3791 local channel
attachment feature on a byte or block multiplexer
channel.
• Remotely, using the 3791 SDLC communications
feature on a 3704 or 3705 Communications
Controller, or a communication adapter on a4331 Processor. Communication can be overswitched or nonswitched lines at up to 9600 bits
per second.
Line Printer: The line printer, a special feature on
the 3791, prints on continuous forms with a spacingof 6 lines per inch. Printing speeds are shown in
Figure 13-18.

Figure 13-14. IBM 3736 Printer3791 Controller Models 11C, 12A,
and 12B
The 3791 Controller offers:• Logic and control storage for system operation• Nonremovable disks for the storage of 3730
documents, programs, and data
• Facilities for using removable diskettes for initialinstallation, document archiving, and backup
applications• A line printer as a special feature (Figure 13-15)

Figure 13-15. IBM 3791 Controller with Line PrinterFeature3790 Communication System
The 3790 Communication System (Figure 13-16) is
an operator-oriented system that consists of a 3791
Controller and its attached operator stations andFigure 13-16. IBM 3790 Communication System
13-10

IBM Input/Output Device Summary

auxiliary control units. The operator stations can be
keyboard-printers, keyboard-displays, or a
combination of these devices.
Following is a description of the 3790 system units.

3791 Controller Models 1C, 2A, and 2B
The 3791 Controller (Figure 13-15), equipped withthe local channel attachment, attaches directly to ahost system's byte multiplexer or block multiplexer
channel. The 3790 system performs functions
specified by programs that are sent to the 3791
Controller from the host system. These programs
permit the 3790 to operate without supervision from,or interaction with, the host system, except whendata or programs are exchanged between systems.
The controller contains:• Control storage for supporting features, functions,and operator stations.
• Diskette storage for packed transmission data andfor backup of application data sets.
• Disk storage for 3790 programs, transaction
records, and application data sets. Based on themodel, the 3791 can have 3.9 to 26.9 million
bytes of storage.
The 3791 Controller has either a local or a remoteattachment to a host system and can have two
special features:• One line printer with 80 or 132 print positions
and speeds of 155 or 410 lines per minute (seeFigure 13-18)• One 3411 Magnetic Tape Unit Modell , to which
no other units can be attached3792 Auxiliary Control Unit
The 3792 Auxiliary Control Unit (Figure 13-17),
which can be placed up to 610 m (2,000 ft) fromthe 3791 Controller, adds operator stations in thesystem (some of which can be remote from the 3790
site) and offers:• The capability for attaching up to four 3793
Key board -Prin ters
• A line printer as a special feature• Special features for communicating with 2741
Communications Terminals• A security keylock special feature that controls
power to the 3792

Figure 13-17. IBM 3792 Auxiliary Control Unit

Attachment
Mailable On

Print Positions

Speed (lines per
minute)3791 , 3792

80* or 132*

155

48

80* or 132*

120

64

80* or 132**80

96

80* or 132*

40

128

132*"

410

48

132***

300

64

132***

230

96

132***

160

128

3791

Charactersin the Set* Line Printer - 80 print positions (155 lpm) special feature.. Line Printer - 132 print positions (ISS lpm) special feature***Line Printer - 132 print positions (410 lpm) special feature

Figure 13-18. Print Rates of the Line Printer Attachment
to the 3791 and 3792

3793 Keyboard-PrinterThe 3793 Keyboard-Printer (Figure 13-19) is adata-entry operator station that can be attached tothe 3791 or to the 3792 to supply printed output.
The 3793 is similar in outward appearance to a
Selectric typewriter. The 3793 has a friction-feed
platen, with a pin-feed platen available as a special
feature . The maximum print line is 130 print
positions at 10 characters per inch; spacing is 6 lines
per inch.
The 3793 keyboard is similar to a normal office
typewriter keyboard and includes control keys,
operator guidance indicators, and system indicators.
Also included on the keyboard is a 10-key
arrangement of dual-function keys that can be used
for entering numeric data. A special feature
supplies a power-line keylock for security.

Chapter 13. Systems

13-11

3286 Printer Models 1 and 2
Models 1 and 2 of the 3286 Printer (Figure 13-9)
attach to the 3791 to obtain hard-copy output at 6lines per inch on continuous fanfold paper.
See "3270 Information Display System" for more
information.

3288 Line Printer Model 2
Figure 13-19. IBM 3793 Keyboard-PrinterModel 2 of the 3288 Line Printer (Figure 13-11)
attaches to the 3791 to obtain hard-copy output at 6lines per inch on continuous fanfold paper.

3790 Communication
System-Miscellaneous Equipment

See " 3270 Information Display System" for more
information.

The following equipment can attach to the 3790
through the 3791 Controller or the 3792 Auxiliary
Control Unit.

3790 Comm~nication System/Data
Entry Configuration

2741 Communication Terminal
The 2741 Communication Terminal (Figure 13-20)
is a Selectric typewriter terminal that satisfies
special system applications in which
one-terminal-per-line operations are needed.

The 3790 Communication System/Data Entry
Configuration is designed for production keying oftranscriptive data using the 3760 Key Entry Station,and for payment-transaction processing using the3762 Payment Transaction Processor. It cannot be
used with any other 3790 configuration.
The 3760 and 3762 stations, described below, attach
to the 3791 Controller Modell C, 2A, or 2B.

3760 Key Entry Station Models 1, 2, and 3
The 3760 Key Entry Station (Figure 13-21) has akeyboard and a display panel for each operator
station. Any task that does not need document
processing can be done on a 3760 as well as on a3762 station. The 3760 has three models:• Model 1 has two keyboards, two displays, a directconnection to a power source, and a cableconnection to the 3791 Controller.
Figure 13-20. IBM 2741 Communication Terminal

3277 Display Station Models 1 and 2
The 3277 Display Station attaches to the 3791 to
supply a CRT display and a 63-character set
keyboard. See "3277 Display Station Models 1
and 2" in Chapter 5 for more information.

3284 Printer Models 1 and 2
Models 1 and 2 of the 3284 Printer attach to the3791 to obtain hard-copy output at 6 lines per inch
on continuous fanfold paper.
See "3270 Information Display System" earlier inthis chapter for more information on the 3284.

13-12

IBM Input/Output Device Summary• Model 2 has two keyboards, two displays, andmust be attached to a Model 1 for power andcontrol. Up to two Model 2s can attach to a
Model 1.
• Model 3 has one keyboard, one display, a directconnection to the power source, and cableconnections to up to four 3791 Controllers. Whena Model 3 is attached to more than one
controller, only one connection can be used at atime.

Model 3 is included). To expand the number ofoperator stations in a combined system, 3760 Model2s can be attached to the 3760 Modell's (up to a
maximum of 24 operator positions).

3850 Mass Storage System

Figure 13-21. IBM 3760 Key Entry Station

3762 Payment Transaction Processor
The 3762 Payment Transaction Processor (Figure13-22) consists of two operating stations housed in asingle physical unit. Each station includes a
keyboard, a document entry slot, a display panel,
two document pockets, a document path, andoptionally, a journal tape print device. Eachdocument path includes anoptical-character recognition reader and canoptionally include an inscriber, audit trail printer,and endorser. The 3762 has a direct connection to a
power source and a cable connection to the 3791
Controller.

The 3850 Mass Storage System (Figure 13-23)
gives low-cost mass storage for as many as 472,000
million bytes of data under the control of avirtual-storage IBM processor. Direct-access device
utilization is improved because only active data
occupies direct-access device space. The 3850
combines many of the advantages of tape and disk
systems.
The highlights of the 3850 follow.
ModelsThe 3851 Mass Storage Facility has 20 models.
They differ in the number of mass storage controls,
data recording devices, data recording controls, andcartridge cells they contain, as shown in Figure13-24.
The smallest model contains a cartridge entry framethat consists of one cartridge access station, twodata recording devices, one data recording control,
and 706 cartridge cells. Larger models, in addition
to the cartridge entry frame, can have up to threeextension frames . Extension frames supply
additional data recording devices, data recording
controls, and cartridge cells. A storage extension
frame contains 1338 cartridge cells; a data extension
frame contains 1338 cartridge cells, two data
recording devices, and one data recording control.
The first character of the model designation
specifies the number of mass storage controls: A for
one mass storage control and B for two. The second
character (0, 1, 2, or 3) specifies the number ofstorage extension frames, and the third character (1,2, 3, or 4) specifies the combination of cartridge
entry frames and data extension frames . The sum of
the second and third characters cannot exceed 4.

Figure 13-22. IBM 3762 Payment Transaction Processor

Restrictions
The maximum number of units that can be attached
to a 3791 Controller is specified by the controller'seight ports. One cable can be attached to each ofthese ports. Therefore, the maximum number of3762s or, in a combined system of 3762s, 3760
Modell's, and 3760 Model 3s that can be attachedis eight (16 operator positions or 15, if one 3760

Either one or two Model-A Mass Storage Facilities,
or one Model-B Mass Storage Facility, can be
attached to a System/370 to become a part of theMass Storage System. Two Model A's may be
configured to permit a capacity of up to 472,000
million bytes.
Operation
Data under control of the 3850 Mass Storage
System is stored on data cartridges. When data is

Chapter 13. Systems

13-13requested, it is moved online from the cartridges todirect access storage devices (DASD) in a process
called staging. After data has been staged, theprocessor has access to it as if it were on a
3330-type DASD. After the data is no longer
needed and if it has been modified, it will be moved
back onto the data cartridge in a process called
destaging.

• Instructing the accessor to move the data
cartridge from its cell to the data recording
deviceAttachment to a Processor• Performing the destaging operation when the data
is no longer needed

Each mass storage control in the 3851 Mass Storage
Facility attaches to a control unit position on aprocessor's byte or block multiplexer channel.
The following are the logical units of the Mass
Storage System (Figure 13-25).

3851 Mass Storage Facility
The 3851 Mass Storage Facility supplies the large
capacity storage and control facility for attachment
to a virtual-storage IBM processor. A description ofMass Storage Facility functional units follow.
Mass Storage Control: The mass storage control
coordinates the operation of the 3850 Mass Storage
System, which includes the following:• Initiating and monitoring the staging operation• Performing error recovery procedures that include
alternate-path-retry operation and device
reallocation for the staging operation

Storage Cells for Data Cartridges: A mass storage
volume has two data cartridges. Data cartridges
reside in cartridge storage cells. Because all
cartridges under control of the mass storage control
are physically resident in the 3851 Mass Storage
Facility, the amount of floor space needed forstorage is greatly reduced.
Data Recording Devices and their Associated Data
Recording Controls: Each cartridge can store
approximately 50.2 million bytes of data. Two
cartridges equal the capacity of one 3336 Disk Pack
Modell. Data is written on and read from the
cartridge by a data recording device and its
associated data recording control.

• Accepting requests for data from the processor• Maintaining an inventory of data cartridges
stored in the 3851 to determine the location ofdata needed

Accessors and Accessor Controls: Two accessors
and their associated accessor controls move the data
cartridges between the storage cells and the data
recording device.

• Allocating space on DASD for data to be staged• Allocating a data recording device

3851 Mass Storage Facility
Models A1, B1

Cartridge Access Station: The cartridge accessstation permits entry and removal of data cartridges.

System/370 Model 158

3330 Disk Storage

Figure 13-23. IBM 3850 Mass Storage System with 3851 Mass Storage Facility, System/370 Model 158, and 3330 Disk
Storage
13-14

IBM Input/Output Device Summary

Number of
Data
RecordingControls

Maximum
UsableCapacity

Mass
Storage
Facility
Models-Number of
Data
Recording
Devices

AOl, BOI

2

1

706

35.3

A02, B02

4

2

2044

102.2

A03, B03

6

3

3382

169.1

A04, B04

8

4

4720

236.0

All, Bll

2

1

2044

102.2

Maximum
Number of
Cartridges--(109

Bytes)

A12, B12

4

2

3382

169.1

A13, B13

6

3

4720

236.0

A21, B21

2

1

3382

169.1

A22, B22

4

2

4720

236.0

A31, B31

2

1

4720

236.0

-Model A's contain one mass storage control, Model B's
contain two.
--This is the maximum number of cartridges, cells, or both ineach Mass Storage Facility. Of this number, however, nine
cartridge cells are reserved in each model: six for FE
maintenance, two for misplaced cartridges, and one for theaccessor.

Figure 13-24. Characteristics of the IBM 3851 Mass
Storage Facility Models

Staging Adapter
The staging adapter performs all the staging anddestaging operations, and permits the processor toaccess the staged data. The staging adapter can beeither a 3830 Storage Control Model 3 or an
Integrated Storage Control with the Staging
Adapter (ISCSA) feature on a System/370 Model

158 or 168. Data is normally staged to 3330 or
3333 disk units. The 3350 staging feature isavailable on a 3830 Model 3 to permit staging data
to 3350 disk units. With this feature installed, only
3350 disk units can be attached to that 3830. Thisfeature is not available on an integrated storage
control.

Direct Access Storage Devices
The direct access storage device (DASD) portion of
the Mass Storage System has either 3333 Disk
Storage and Controls Model 1 or 11 and 3330 Disk
Storage Modell, 2, or 11, or 3350 Direct Access
Storage Models A2, A2F, B2, B2F, C2, or C2f
units. The 3330/3333 and 3350 storage units makedata available to an IBM processor for processing.
Disk Storage Configuration
The 3330 and 3350 Disk Storage seriesconfiguration varies with the 3851 configuration. A
maximum of thirty-two 3330 drives can be attached
to a 3830 Model 3 or to each path of the integrated
storage controls of processors with the staging
adapter feature. For 3330 Models 1 and 2, sixteenof these drives can be used as staging drives for theMass Storage System. The additional disk drives
are used for standard DASD operations. For 3330
Model 11, a maximum of eight drives can be usedas staging drives. 3350 drives used for staging are
configured the same as 3330 Model 11 drives but
cannot be connected to the ISCSA. Access to the3350 drives is in 3330 Model 11 mode.

Chapter 13. Systems

13-15

Host Processorr--- ---- 1
Mass Storage Control

I

Accessors andControls Accessor

Stagi ng Adapter

I

Data
Recording
DeviceData
Cartridges

Data
Recording
Device
Data
RecordingControl

.....

"

"--~
DASD

Cartridge Access
StationFigure 13-25. Logical Units of the Mass Storage System

13-16

IBM Input/Output Device Summary

'- -

--'

Appendix A. I/O Attachment Data
IBM input/output (I/O) devices and systems for
local operation with IBM processors operate throughone control unit position (two are needed for the3851 Mass Storage Facility Model Bs on an IBM
channel, or through an integrated adapter on theprocessor. The control unit function can be part of
the I/0 device, part of the system, part of theintegrated adapter on the processor, or a physicallyseparate device.

Figure A-I lists the I/0 devices and systems andtheir method of attachment arranged by category.
For further information about their attachment
capabilities to IBM processors, see the input/output
configurator for a specific processor.

I/O Device, Control Unit, or System

Model

Means of Attachment to Channel or
Adapter

Audio Communication Devices

7770 Audio Response Unit·

3

Auxiliary Processors

3838 Array Processor

1 through 3

DirectDirect Access Storage Devices
and Control Units

2305 Fixed Head Storage

22835 Model 22835 Storage Control

2

Direct3310 Direct Access Storage

AI, A2

DirectBl, B23310 Model A23330 Disk Storage

1, 23333 Models 1 and 11113333 Models 1 and 113333 Disk Storage and Control

1

Direct3830 Model 2
3830 Model 3
3880

11

Direct3830 Model 2
3830 Model 3
3880

A2

Direct3830 Model 2
3880

3340 Direct Access Storage Facility

Bl, B23340 Model A23344 Direct Access Storage

B2,B2F

3340 Model A23350 Direct Access Storage

A2, A2F

Direct3830 Model 2
3830 Model 3
3880

B2,B2F
C2,C2F

3350 Model A23350 Model A2F

Al

Direct3880

3370 Direct Access Storage

Diskette Input/Output Devices

DirectBl

3370 Model Al

3830 Storage Control

2,3

Direct3880 Storage Control

1

Direct3540 Diskette Input/Output Unit

Bl, B2

Direct·For attachment to a channel for operation with one or more attached inquiry terminals.

Figure A-I (Part I of 3). Attachment Data for Local I/O Equipment

Appendix A. I/O Attachment Data

A-I

I/O Device, Control Unit, or System
Display Devices and Control
Units

Magnetic Character Reading
Devices

Magnetic Tape Devices andControl Units

Optical Readers

Model

Means of Attachment to Channel or
Adapter

3251 Display Station

13255 Display Control

13258 Modell

3258 Control Unit

1

Direct3272 Control Unit

1,2

Direct3277 Display Station

1,23272 Models 1 and 23279 Color Display_ Station

2A, 2B, 3A, 3B 3274 Models lA, IB, and 1D

3732 Text Display Station

N/A

Direct8775 Display Terminal

1,2

Direct or Data Link

1255 Magnetic Character Reader

3255 Modell
3258 Modell

11, 12

Data Link

1 through 3

DirectDirect1419 Magnetic Character Reader

1 through 53890 Document Processor

Al through B6 Direct3410 Magnetic Tape Unit

1 through 33411 Models 1 through 33411 Magnetic TllQe and Control

1 through 3

Direct3420 Magnetic Tape Unit

3,53803 Models 1 through 373803 Models 1 and 2

4,6,83803 Model 2
Direct3803 Tape Control

1 through 38809 Magnetic Tape Unit

lA, 1B, 2, 38809 Models 1A and 1B

1287 Optical Reader

1 through 4

Direct5

Direct1288 Optical Page Reader

1

Direct3881 Optical Mark Reader

1

Direct

3886 Optical Character Reader

1

DirectPrinter-Keyboards and Consoles

3215 Console Printer-Keyboard

1

DirectPrinter and Control Units

1403 Printer

2,7, NI

2821 Models 1,2, 3, and 5
Direct1443 PrinterNI

Direct2821 Control Unit

1, 2, 3, 5, and6

Direct3203 Printer

1,2,4

Direct3211 Printer13811 Modell

3213 Console Printer1

Direct1, 11

Direct2, 12System Loop3, 133274 Models lA, IB, and 1D

3284 Printer

1,2

3272 Models 1 and 2

3286 Printer

1, 2

3272 Models 1 and 23287 Printer

1,2

Direct3262 Line Printer3288 Line Printer23272 Model 23736 Printer

N/A

Direct

3800 Printing Subsystem

1

Direct3811 Printer Control Unit

1

Direct5203 Printer3

Direct5213 Printer1

DirectFigure A-I (Part 2 of 3). Attachment Data for Local I/O Equipment

A-2

IBM Input/Output Device Summary

I/O Defice, Control Unit, or System
Punched Card Defices

Model

Means of Attachment to Channel or
Adapter

1442 Card Read Punch

NI, N2

Direct250 I Card Reader

BI, B2

Direct2520 Card Read Punch

BI

Direct2520 Card Punch

B2,B3

Direct2540 Card Read Punch

I2821 Models 1, 5, and 62560 Multi-Function Card Machine3504 Card Reader

Al

DirectA2

DirectAI, A2

Direct

3505 Card Reader

BI, B2

Direct3525 Card Punch

PI through P33505 Models B I and B2
Direct5425 Multi-Function Card Unit

AI, A2

DirectPunched Tape Devices andControl Units

2671 Paper Tape Reader

I

2822 Model I

2822 Paper Tape Reader Control

I

DirectSystems

3250 Gr~hics DiSQIay System

N/A

3258

3270 Information Display System

N/A3272 Models I and 23272 Control Unit

I, 2

Direct3730 Distributed OfficeCommunications System

N/A3791 Models IIC, 12A, and 13B

3790 Communication System

NJA

3791 Models lA, IB, IC, 2A, and 2B

3791 Controller

lA, IB, IC,
2A, 2B, IIC,
12A,12B

Direct3850 Mass Storage System

N/A3851 Models AOl, A02, A03, A04, All,
A12, A13, A2l, A22, A31, BOl, B02,
B03, B04, Bll, B12, B13, A2l, A22, A3l

3851 Mass Storage Facility

AOI, A02,
3830 Model 3
A03, A04,
DirectAll, A12,
A13, A2l,
A22, A23, A3l
BOI, B02, B03,
B04, BII, B12,
B13, B2l, B22,
B23, B31
B1 through B4

Figure A-I (Part 3 of 3). Attachment Data for Local I/O Equipment

Appendix A. I/O Attachment Data

A-3

Glossary and Abbreviations
This glossary includes definitions developed by the American
National Standards Institute (ANSI) and the International
Organization for Standardization (ISO). This material isreproduced from the American National Dictionary for
Information Processing. copyright 1977 by the Computer andBusiness Equipment Manufacturers Association, copies of which
may be purchased from the American National Standards
Institute, 1430 Broadway, New York, New York 10018. ANSI
definitions are preceded by an asterisk (-).
The following terms are defined as they are used in thispublication. If you do not find the term you are looking for, see
the IBM Data Processing Glossary.

A/FE: Americas/Far East.
-alphameric: Synonym for alphanumeric. Pertaining to acharacter set that contains letters, digits, and usually othercharacters, such as punctuation marks.

DASD: Direct access storage device.
data density: On magnetic tape, the number of bytes per inch.
data mode 1: On 80-column punched card devices, the standard
code used is EBCDIC or data mode 1. This code uses eightbinary positions for each character format, plus a position forparity checking. 256 characters can be coded, including both
uppercase and lowercase alphabetic characters, a wide range or
special characters, and many control characters that aremeaningful to some input/output devices.
data mode 2: This feature is also known as column binary andcard image. It enables the reader to suspend validity checking forcolumn binary data.
data transfer rate (effective): (SCI) In data communication the
average number of bits, characters, or blocks per unit timetransferred from a data source and accepted as valid by a data
link. The data transfer rate is usually expressed in bits,
characters, or blocks per second, minute, or hour.
DDA: Direct disk attachment.

-BCD: Binary coded decimal notation.
-Binary coded decimal notation: (ISO) A binary-coded notationin which each of the decimal digits is represented by a binary
numeral, e.g., in binary-coded decimal notation that uses theweights 8-4-2-1, the number "twenty three" is represented by0010 0011 (compare its representation 10111 in the pure binary
numeration system). Synonymous with binary-coded decimalcode, binary-coded decimal representation, coded decimal
notation.
bits per second: In serial transmission, the instantaneous bit speedwith which a device or channel transmits a character.
block multipexer channel: A mUltiplexer channel that interleaves
blocks of data.
BPI: Byte.:; per inch.
bps: Bits per second.
• buffer: A routine or storage used to compensate for a difference
in rate of flow of data, or time of occurrence of events, whentransferring data from one device to another.
burst mode: A mode in which data is transmitted by means ofburst transmission.
byte multiplexer channel: A multiplexer channel that interleaves
bytes of data.
·channel: A path along which signals can be sent, for example,
data channel, output channel.
common-use sizes: A set of paper form sizes used on the IBM
3800 Printing Subsystem that have been selected as those mostcommonly used throughout the world.

disl(ette: A thin, flexible magnetic disk and a semi-rigid
protective jacket, in which the disk is permanently enclosed.
Synonymous with flexible disk.
DPCX: Distributed processing control executive.
DPPX: Distributed processing programming executive.
dual density: A feature that permits a program to use a tape unit
in either 800 or 1600 bytes per inch recording.
EBCDIC: Extended binary-coded decimal interchange code.
extended binary-coded decimal interchange code: A set of 256
characters, each represented by eight bits.
·form overlay: Synonym for form flash. (SCI) A projected
pattern such as a report form, grid, or map used as backgroundfor a display image.
GAM: Graphics access method.
·gangpunch: To punch indentical hole patterns into each punch
card of a card deck.
GCR: Group coded recording.
GPS: Graphic programming services.
graphic programming services: In OS/360 and OS/VS, a numberof services provided for use in designing and executing programs
that communicate with a user at a display station.
graphics access method: A facility that supports IBM display
devices through the use of graphic programming services (GPS)and the graphic subroutine package (GSP).

·console: A part of a computer used for communication between
the operator or maintenance engineer and the computer.

group coded recording: Group coded recording is synonymouswith 6250 bits per inch recording. In contrast with phase encoded
recording, non-return-to-zero change-on-ones recording.

cpi: Characters per inch.

GSP: Graphic subroutine package.

CRT: Cathode-ray tube.
cryptographic: Pertaining to equipment that transforms data tomask its actual meaning to an unauthorized user.
customer set up products: IBM products such as the 3767
Communication Terminal and 3770 Data Communication System
which can be installed by th~ customer.

host system: The data processing system to which a
communication system is connected and with which the system
can communicate.
IBG: Interblock gap.
IFA: Integrated file adapter.
Glossary and Abbreviations

G-I

-input/output: (ISO) Pertaining to a device or to a channel that
may be involved in an input process, and, at a different time, inan output process.

OS/VS2: A virtual storage operating system that is an extensionof the IBM System/360 Operating System that supports
multiprogramming with a variable number of tasks (OS/MVT).

Integrated file adapter: An adapter that permits connection ofmultiple disk storage devices to a processing unit.

PE: Phase encoding.

interblock gap: (ISO) The space between two consecutive blocks
on a data medium.
ISCSA: Integrated storage control with the staging adapter.
K-byte: Each K-byte equals 1,024 bytes and refers to storage
capacity.
-loop: In data communication, an electrical path connecting astation and a channel.
Ipm: Lines per minute.
magnetic character recognition: The character recognition ofcharacters printed with ink that contain particles of a magnetic
material. Contrast with optical character recognition.
maintenance device: The maintenance device is a primary
maintenance tool for some IBM products. It is programmable,
small, and lightweight. It consists of two units, the keyboard
display unit and the basic unit, connected to each other by acable.
MD: Maintenance device.
MICR: (ISO) Magnetic ink character recognition.
microprocessor: A processing unit, or part of a processing unit,that consists of microcode.
MP: Multiprocessor.
MSS: Mass Storage System.
multiplexer channel: A channel designed to operate with anumber of I/O devices simultaneously. Several I/O devices cantransfer records at the same time by interleaving items of data.

phase encoding: Synonym for phase modulation recording. (ISO)A method of recording on magnetic tape in which each storage
cell is divided into two regions which are magnetized in opposite
senses; the sequence of these senses indicates whether the binary
character represented is zero or one.
read/write head: (ISO) A magnetic head capable of reading andwriting.
remote: In data communication, pertaining to devices that areconnected to a data processing system through a data link.
-reproduce: Synonym for duplicate. (ISO) To copy from asource to a destination that has the same physical form as thesource, e.g., to punch new punched cards with the same patternof holes as an original punched card.
rotational delay: In a rotating storage device, the time period
between the request and the positioning of the desired record
under the read head.
rotational position sensing: A feature that permits a disk storage
device to disconnect from a block multiplexer channel (or its
equivalent), allowing the channel to service other devices on thechannel during positional delay.
SCP: System control programming.
SDLC: Synchronous data link control.
selector channel: An I/O channel designed to operate with only
one I/O device at a time. Once the I/O device is selected, acomplete record is transferred one byte at a time. Contrast withblock multiplexer channel, multiplexer channel.
SNA: Systems network architecture.

multiprocessor: A system consisting of two or more processing
units (or ALUs, or processors) that can communicate withoutmanual intervention.

summary punch: (ISO) A card punch that may be connected toanother device, such as a tabulator, to enter data that wascalculated or summarized by the other device.

MVS: Multiple virtual storage. An alternate name for OS/VS2,
release 2.

system control programming: IBM-supplied programming that isfundamental to the operation and maintenance of the system. It
serves as an interface with program products and user programs
and is available without additional charge.

nondestructive cursor: On a CRT display device, a cursor thatcan be moved within a display' surface without changing or
destroying the data displayed on the screen.
non-return-to-zero change-on-ones recording: (ISO)Nonreturn-to-reference recording of binary digits such that theones are represented by a change in the condition ofmagnetization, and the zeros are represented by the absence of achange. This method is called (mark) recording because only theone or mark signals are explicitly recorded. Synonymous with
non-return-to-zero (mark) recording, NRZ(M).
NRZI: Non-return-to-zero change-on-ones recording.
OCR: Optical character recognition.
optical character recognition: (ISO) character recognition thatuses optical means to identify graphic characters. Contrast withmagnetic ink character recognition.
OS/VSl: A virtual storage operating system that is an extensionof the IBM System/360 Operating System that supports
multiprogramming with a fixed number of tasks (OS/MFf).

systems network architecture: The total description of the logicalstructure, formats, protocols, and operational sequences fortransmitting information units through the communication
system. Communication system functions are separated into three
discrete areas: the application layer, the function management
layer, and the transmission subsystem layer. The structure of
SNA allows the ultimate origins and destinations of
information-that is, the end users-to be independent of, andunaffected by, the specific communication-system services andfacilities used for information exchange.
throughput: (ISO) A measure of the amount of work performed
by a computer system over a given period of time, for example,
jobs per day.
universal character set: A printer feature that permits the use ofa variety of character arrays.
using system: In a teleprocessing environment, the remote systemthat is operating the I/O devices at the remote site.
oG-2

IBM Input/Output Device Summary

virtual storage: (ISO) The concept of storage space that may be
regarded as addressable main storage by the user of a computer
system in which virtual addresses are assigned to real addresses.
The size of virtual storage is limited by the adddressing schemeof the computing system and by the amount of auxiliary storage
available, and not by the actual number of main storage
locations.
51-column card: A punch card that has been altered to beequivalent to the 80-column card but includes only column 15
through 65. The remainder of the card is missing.

80-column card: Synonym for Hollerith card. A punch cardcharacterized by 80 columns and 12 rows of punch positions.
96-column card: A punch card characterized by 32 columns and
22 rows. The top four rows are for printing and the other 18
rows are for punching. The punch rows of the card are divided
into three strips of 32 columns and 6 rows. It is possible to print
128 characters and to punch 96 positions on a card.

Glossary and Abbreviations

G-3

Index
The entries in this index are shown as they appear in the text ofthe book, that is, capitalized words are capitalized in text,
lowercase words are lowercase in text, etc.

attachment data for local I/O equipment
audio communication device
1-1
auxiliary processor 2-1
card print
11-5
2560
3525
11-8
5425
11-9
card punch
1442
11-1,11-2
2520
11-3,11-4
2540
11-4
11-5
2560
3525
11-8
5425
11-9
card read
11-1
1442
2501
11-2
11-3
2520
2540
11-4
2560
11-5
3504
11-6
3505
11-6
5425
11-9
card read punch
11-1
1442
2520
11-3
2540
11-4
2560
11-5
5425
11-9
check sorter
6-1
1255
1419
6-2
3890 6-4
13-7
color printcommunication system, 3790
console printer 9-1
3215
9-1
control unit
3-1
2835
3255
5-1,13-2
3258
5-1,13-3
3272
5-2,13-4
3274
5-2,13-4
3333
3-6
3411
7-1
3791
13-10,13-11
13-11
3792
3803
7-4
3811
1O-l2
3830 3-23880 3-3
crytographic unit, 3848
2-2
data cartridge
13-13
data mode 1 11-1
data mode 2
11-2
direct access storage device
2305
3-5
3310 3-5
3330
3-6
3333
3-6
3340 3-7

13-10,13-12

A-I

3344 3-7
3350 3-83370 3-9
disk pack3336 3-6
3348
3-7
disk storage control
3-1
2835
3830 3-23880 3-3
disk storage unit
3-5
2305
3310 3-53330 3-63333
3-63340 3-7
3344 3-7
3350 3-83370 3-9
diskette input/output device, 3540 4-1
display control
3255
5-1,13-2
3258
5-1,13-33272 5-2,13-4
3274 5-2,13-4
display device
3251
5-1,13-2
3277
5-2,13-5,13-12
3278
5-3,13-53279 5-5,13-6
3732
13-9
8775
5-6
display system
13-1
3250
3270
13-3
Distributed Processing Control Executive
5-8
Distributed Processing Programming Executive
document reader
1255 6-1
1287
8-1
1288
8-2
1419 6-2
3881
8-4
3886 8-5
3890 6-4
document sorter
1255 6-1
1419 6-2
3890 6-4
EBCDIC

5-8

11-14

fixed head feature
3-8
fixed head storage, 2305
3-5
font
8-2
Farrington Selfchek 7B
8-2
IBM 1428
NCR Optical
8-2
OCR-A
8-2

3-1

Graphic Programming Services
5-2
13-1
graphics display system, 3250
group coded recording
7-3
information display system, 3270
13-3
I/O (input/output), attachment data for local
equipment
A-I
Index

I-I

Katakana

5-2light pen 5-1,5-2,5-3,5-5,5-6,5-8,13-1
line printer
1403
10-1
1443 10-3
3203
10-4
3211
10-5
3262 10-6
3288
13-53289 13-5
5203
10-12
magnetic character reader
1255 6-1
1419 6-2
magnetic slot reader 5-7
magnetic tape device 7-1
magnetic tape unit
3410 7-13411
7-13420 7-2
8809 7-5
mass storage facility, 3851
13-13,13-14
mass storage system, 3850 13-13
monochrome print 13-7
multi-function card machine
2560 11-5
5425
11-9
NRZI (non-return-to-zero change-on-onesrecording)
7-2,7-3,7-4
one-half inch magnetic tape 7-1
Operator Identification Card Reader
optical reader 8-1
1287 8-1
1288 8-2
3881
8-4
3886 8-5

Security Keylock 5-3,5-5,5-7
selector light pen 5-3,5-5,5-6,5-8,13-1
serial printer3215 9-1
3284 13-6,13-12
3286 13-6,13-12
3287
13-7
3736 13-9
system3250 13-1
3270 13-3
3730 13-93790 13-10,13-12
3850 13-13

5-3

page printer, 3800 10-9
page reader
1287 8-1
1288 8-2
3881
8-4
3886 8-5
paper tape device
2671
12-1
2822
12-2
PE (phase encoded recording) 7-2
Personalization/Key Entry Unit 2-2
printer
1403
10-1
1443
10-3
3203
10-4
3211
10-5
3215 9-1
3262
10-6
3284
13-6,13-12
3286 13-6,13-12
3287
13-7
3288
13-7,13-12
3289
13-8
3736
13-9
3791
13-10,13-11
3800 10-9
5203
10-12
1-2

printer control unit
2821
10-3
3811
10-12
printer-keyboard 9-1
3215 9-1
punch card
51-column 6-4,11-580-column 11-1;11-4
96-column 11-1,11-9
punched card device
1442 11-12501
11-22520 11-3
2540 11-4
2560 11-53504 11-6
3505
11-7
3525
11-8
5425
11-9
punched tape device 12-1
2671
12-1
2822 12-2

IBM Input/Output Device Summary

table
Attachment Data for Local I/O Equipment(Appendix A) A-I
Characteristics of Models of the3851 Mass Storage Facility Models Al to A4
and Bl to B4 (Figure 13-24) 13-15
Comparison Data for Card Devices(Figure 11-11) 11-11
Comparison Data for Magnetic Character
Readers (Figure 6-7) 6-5
Comparison Data for Optical Readers (Figure 8-7) 8-6
Comparison Data for Printers (Figure 10-17)
10-14Comparison of Capacities for Disk Storage(Figure 3-14) 3-13
Comparison of Characteristics for Disk Storage(Figure 3-13) 3-12
Comparison of Characteristics for Magnetic Tape
Devices (Figure 7-5) 7-7
Comparison of Characteristics for Storage
Controls (Figure 3-12) 3-12
Comparison of Features for Storage Controls and
Disk Storage (Figure 3-11) 3-11
Comparison of Performance for Disk Storage(Figure 3-15) 3-13
Fonts
Letters, and Symbols Read by the 1287
(Figure 8-2) 8-2
Letters, and Symbols Read by the 3886 Model 1(Figure 8-6) 8-5
Print Rates of the Line Printer attachment to the3791 and 3792 (Figure 13-18)
13-11
3800 Print Speed Ranges (Figure 10-13)10-10tape, magnetic 7-1

tape control unit
3411
7-1
3803
7-4
tape unit
3410 7-13411
7-13420 7-2
8809 7-5
terminal
5-1,13-2
3251
5-2,13-5,13-12
3277
5-3,13-5
3278
5-5,13-6
3279
13-9
3732
5-6
8775
train cartridge
1416
10-1,10-43216
10-5
two channel switch - pair feature
3-4
two channel switch feature
3-2,7-5,10-12
universal character set
VSAM
VTAM

10-2,10-4,10-6

2-2
2-2

1255 Magnetic Character Reader 6-1
1287 Optical Reader 8-1
1288 Optical Page Reader 8-2
1403 Printer10-11416 Interchangeable Train Cartridge
10-11419 Magnetic Character Reader 6-2
1428 font
8-2
1442 Card Punch
11-2
11-1
1442 Card Read Punch
1443 Printer10-3
2305 Fixed Head Storage 3-52501 Card Reader
11-22520 Card Punch
11-4
2520 Card Read Punch
11-3
2540 Card Read Punch
11-4
2560 Multi-Function Card Machine
11-52671 Paper Tape Reader
12-12741 Communications Terminal
13-12
2821 Control Unit
10-32822 Paper Tape Reader Control
12-2
2835 Storage Control 3-1
2880 Block Multiplexer Channel 2-2
3203 Printer10-4
3211 Printer10-53215 Console Printer-Keyboard 9-1
3216 Interchangeable Train Cartridge
10-53250 Graphics Display System
13-1
3251 Display Station 5-1,13-2
3255 Display Control 5-1,13-2
3258 Control Unit 5-1,13-3
10-6
3262 Line Printer3270 Information Display System
13-33272 Control Unit
5-2,13-43274 Control Unit
5-2,13-4
3277 Display Station 5-2,13-5,13-12
3278 Display Station
5-3,13-53279 Color Display Station
5-5,13-6
3284 Printer
13-6,13-12
3286 Printer
13-6,13-12
3287 Printer
13-7
3288 Line Printer13-7,13-12
3289 Line Printer13-83310 Direct Access Storage 3-53330 Disk Storage 3-63333 Disk Storage and Control
3-6
3336 Disk Pack 3-6
3340 Direct Access Storage Facility 3-7
3344 Direct Access Storage 3-73348 Disk Module 3-7
3350 Direct Access Storage 3-83350 Staging Feature 3-3
3370 Direct Access Storage 3-93410 Magnetic Tape Unit 7-1
3411 Magnetic Tape Unit and Control 7-1
3420 Magnetic Tape Unit 7-23504 Card Reader
11-63505 Card Reader
11-73525 Card Punch
11-83540 Diskette Input/Output Unit 4-1
3730 Distributed Office Communication System
3732 Text Display Station
13-93736 Printer13-93760 Key Entry Station
13-12
3762 Payment Transaction Processor
13-133790 Communication System
13-10,13-12
3791 Controller
13-10,13-11
3792 Auxiliary Control Unit
13-11
3793 Keyboard - Printer13-11
3800 Printer Subsystem
10-93803 Tape Control 7-4
3811 Printer Control Unit
10-12
3830 Storage Control 3-2
3838 Array Processor 2-1
3848 Cryptographic Unit Model 1 2-23850 Mass Storage System
13-133851 Mass Storage Facility
13-13,13-14
3880 Storage Control 3-3
3881 Optical Mark Reader 8-4
3886 Optical Character Reader 8-5
3890 Document Processor 6-4
5203 Printer
10-12
5213 Printer 9-1
5425 Multi-Function Card Unit
7770 Audio Response Unit

13-9

11-9

1-1

8775 Display Terminal 5-6
8809 Magnetic Tape Unit 7-5
96-column punched-card device, 5425

11-9

Index

1-3

IBM Input/Output
Device Summary
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International Business Machines Corporation
Data Processing Division
1133 Westchester Avenue, White Plains, N.Y. 10604
IBM World Trade Americas/Far East Corporation
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GA32-0039-1

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International Business Machines Corporation
Data Processing Division
1133 Westchester Avenue, White Plains, N.Y. 10604
IBM World Trade Americas/Far East Corporation
Town of Mount Pleasant, Route 9, North Tarrytown, N.Y., U.S.A. 10591
IBM World Trade Europe/Middle East/Africa Corporation
360 Hamilton Avenue, White Plains, N.Y. , U.S.A. 10601