Print point reposition feature for an electronic typewriter

On electronic typewriters which have the ability to record into a small working memory the escapement of the characters which are keyed at the keyboard, it is many times advantageous to be able to reposition the carrier at the rightmost end of the typed material automatically. This is particularly advantageous when it has been necessary to back the carrier up along the printed line for purposes of erasing, correcting or inserting material into that line. Disclosed herein is an electronic typewriter which is controlled by the electronic logic such that the depression of a selected control key will result in the carrier moving from a position within the typed text on a particular line to the right most position the carrier has occupied within that line during earlier typing. This is accomplished by temporarily storing the rightmost carrier position as recorded in the escapement register into a working memory and then upon the appropriate command from the keyboard, using that location in the manner that a tab stop location would be used and creating a tab like command movement to cause the carrier to go directly to that point and stop.

BACKGROUND OF THE INVENTION 
In typewriters as they presently exist, whether they be electric powered or 
electronically controlled electric powered typewriters, when the operator 
causes the print point to move backward into the line of typing, for 
example, to correct an error or to remove an erroneous graphic from the 
page or to insert characters, the print carrier must be escaped rightward 
to the rightmost end of the print line before printing or typing may be 
resumed. Typically this is controlled by the operator by the use of 
functions such as tabulation and space. The use of the tabulation command 
necessitates the operator knowing exactly where the tabulation stops are 
located and the ability to then associate that location with the right 
most printed position on the typing line. This requires the operator to 
perform the operation consciously or alternatively to use the repeat space 
function and continue this operation through an extended period until the 
carrier has again assumed the desired position at the right most end of 
the typed material. 
With the advent of proportional spacing typewriters and their increasing 
usage, the need to reposition the carrier very accurately is further 
necessitated and complicated by the fact that the characters in 
proportional spacing vary in width and therefore, the print point for the 
next character after the rightmost position of the typing line may well 
not correspond with a set or fixed character position. This will further 
compound the use of the tab and space routine described above since it 
will necessitate backspacing by one unit through one or more cycles to 
accurately place the carrier at the next character print point. 
Even the routine of entering a tab stop prior to backing the carrier to the 
correction point will not work satisfactorily in the proportional spacing 
routine inasmuch as tab stops may only be set at predetermined character 
positions and cannot usually be set at individual escapement unit 
positions. 
It is therefore an object of this invention to electronically control the 
carrier of a typewriter to place the print point immediately over the 
print point occupied at the rightmost position of the carrier in that 
particular writing line. 
It is another object of this invention to control the print carrier to 
effect repositioning of the print point at the right most point in the 
typing line, by keyboard control. 
It is still another object of this invention to simplify the demands on the 
operator in repositioning the carrier at the rightmost end of the writing 
line after the carrier has been positioned over a previous print point. 
SUMMARY OF THE INVENTION 
The reposition mode of operation in the electronic typewriter is 
accomplished after the print carrier has been moved backwards along the 
print line for correction or deletion of material or for some other reason 
and the operator wishes to continue typing starting to the right of the 
last printed character on that line. The operator may accomplish this 
rapid, effective rightward movement of the print point by the depression 
of an appropriate control key on the typewriter keyboard. This depression 
of the control key causes the electronic logic to go through a 
predetermined sequence of events and functions to control and command the 
carrier to move rightward and to stop at the exact position previously 
occupied by the carrier prior to the carrier having been reverse escaped 
along the writing line. This is accomplished in the electronics by the 
continual storing and updating in a register of a value representing the 
rightmost position of the carrier during any one writing line. Upon the 
command from the keyboard to reposition the print point over the right 
most previous print point on the writing line, the escapement value or 
line count value stored in this register is used as a temporary tab stop 
value. The information is retrieved from the reposition register and is 
used as a destination value and a tabulation operation is effected. With 
the tabulation routine being initiated and the rightmost position being 
used as a temporary tab stop value, the carrier will tabulate to that 
position and stop. At that point the typewriter is then again ready to 
resume normal typing.

DESCRIPTION OF THE INVENTION 
For purposes of this discussion and disclosure, it is assumed that the 
typewriter or printer 10 is in operation, that typing has occured in a 
normal and conventional manner, and that the characters as they are typed 
are stored into a line memory 34 which upon a carrier return is cleared to 
provide the capability to store characters from the next line. 
The operator from time to time may desire to make corrections in the text 
typed in that particular print line which are displaced from the print 
point by more than one character position. When this occurs, the carrier 
13 may be backspaced until it is appropriately aligned with the erroneous 
character and the correction or deletion made. At this point, it is 
desirable to be able to return to the right most printing position on the 
typing line to resume typing in a normal manner. The typewriter 10 has a 
keyboard 12 which converts mechanical key movement to electrical signals 
B1-B7 and signals for tab, space, erase, backspace and reposition and 
outputs these signals from the main keyboard 14, special function section 
36 and coded function section 46 which then send the electrical signals to 
the coded function decode 44, function decode 38 or character and velocity 
decode 18. In the case of characters, the character and velocity decode 18 
outputs signals to the magnet drivers 20 which are data signal controlled 
switches to control electromagnets for operation of the mechanical 
controls to effect character selection and printing. Character selection 
and printing is accomplished through the magnet drivers 20 by controlling 
the electromagnets through signals R1, R2, R3, representing rotate codes, 
T1 and T2 representing tilt codes and V1 and V2 representing velocity 
codes. Different combinations of the signals R1-R3, T1, T2, V1 and V2 will 
result in different characters being selected by the rotate codes R1 
through R3 and the tilt codes T1, T2, while the printing velocities V1 and 
V2 will determine the impact levels with which selected characters are 
printed. The special function section 36 outputs signals directly to the 
function decode 38 to control such operations as space, tab and erase. 
Assuming that the typing has progressed under a normal course of events, 
the operator, through the coded functions section 46 of the keyboard 12 as 
illustrated in FIG. 1, may command one or several backspaces to effect the 
reverse positioning of the print carrier 13. The backspace function code 
is then transmitted to the coded function decode 44 which in turn provides 
an output to the escapement logic 22. The escapement logic 22 recognizing, 
that the command is a backspace command, will access the line memory 34 to 
determine that character in the immediately leftward print position. Upon 
the determination of that character, the escapement logic 22 then uses a 
table look up sequence to determine the escapement value assigned that 
character. Upon the determination of that value, the escapement register 
24 is updated to reflect a destination equal to the present carrier 
position less the escapement value of the character accessed from the line 
memory 34. Upon the escapement logic 22 inserting the new value into the 
escapement register 24, the escapement counter 26 is loaded with a value 
corresponding to the distance that the carrier 13 must move during a 
particular cycle and the escapement logic 22 turns on the magnet drivers 
30 to effect escapement reverse direction and drive. As the carrier 13 
translates, the lead screw 19 rotates driving the carrier 13 and at the 
same time driving an emitter wheel 21 which when paired with a 
photoemitter/sensor 17 produces emitter pulses which wnen utilized 
together with a signal from the pitch selection mechanism 29 of the 
typewriter 10 passes through the integrator 28 to effect the decrementing 
of the escapement counter 26 to zero. As the escapement counter 26 reaches 
zero the magnet drivers 30 causing activation of magnets 31 and the 
movement of the carrier 13 are turned off. 
After the backspacing has occured, either due to a backspace function or 
due to a correction function, the insertion or erase operation is 
performed by the operator. 
In order to maintain data with respect to the rightmost position of the 
carrier 13 during any one typing line, the reposition register 48 is 
connected to and controlled by the escapement logic 22. As each escapement 
occurs during normal typing, the value of the escapement register 24 is 
stored in the reposition register 48. In the event that the escapement 
logic 22 performs a backspace the reposition register 48 is not 
decremented during such movement but remains at the previous value. 
Upon a reposition command being keyboarded by the initiation of the 
alternate function output from the coded function section 46 and a 
predesignated alphanumeric key 11 of keyboard 12, the coded function 
decode 44 decodes the keyboard signals and translates them into signals 
which are then passed to the escapement logic 22. Block 47 of FIG. 1 
merely illustrates that both reposition and backspace can be commanded 
from coded function section 46 and a respective predesignated key 11 of 
main keyboard 14 for each operation. Upon the receipt of the decoded 
reposition command the escapement logic 22 transfers control to the 
reposition logic block 42. The reposition logic block 42 then forces the 
value in the escapement register 24 to be subtracted from the value in the 
reposition register 48. The resulting difference, under the control of the 
reposition logic block 42 acting through the escapement logic 22 is stored 
into the escapement counter 26 resulting in the turning on of the magnet 
drivers 30 to effect escapement, forward direction and drive. As the 
carrier 13 moves, feedback from the printer 10 in the form of the 
photoemitter/sensor pulses and pitch selection signal passed through the 
integrator 28 will decrement the escapement counter 26 until the 
escapement counter 26 reaches zero thus turning off the magnet drives 30. 
Upon the turning off of the magnet drives 30, the carrier 13 will occupy a 
position which is identical to the position occupied at the rightmost 
point in that typing line during the previous typing operations and 
corresponding to the value in the reposition register 48. Upon the loading 
of the delta distance between the reposition register 48 value and the 
escapement register 24 value, the escapement logic 22 will also load the 
reposition register 48 value into the escapement register 24 so that at 
the end of the reposition operation the escapement register 24 will 
accurately represent the position of the carrier 13 on the typing line. 
The controls necessary to control the typewriter 10 which have been 
explained above in block diagram form is preferably embodied in 
operational sequences of the electronic logic and devices which may be 
represented by the flow charts in FIGS. 3 through 5. To more fully 
understand the operational sequences in logical controls which are part of 
the block diagram in FIG. 1 reference is made to FIGS. 3, 4 and 5. 
Referring to FIG. 3 the main flow for the logic contained in the 
reposition logic block 42 of FIG. 1 is illustrated in conventional flow 
chart form. Upon the receipt of any command or signal, the logic will 
determine whether the signal is a keyboard input 50. If the signal is not 
a keyboard input 50 then the routine continues to wait for a keyboard 
input by branching through the "no" path and checking the next signal 
received. When a keyboard input signal is received the "yes" path is 
followed and the signal is checked to determine whether it represents a 
reposition command 52. If the signal is a reposition command 52 then the 
flow will branch to the reposition routine 54. This will be discussed more 
fully below. If the command received is not a reposition routine command 
52 the "no" path is followed. If the command is detected to be a space 56, 
a tab 58, or a character 60, the logic will then branch to the carrier 
movement routine 62. If the signal which has been determined not to be a 
reposition signal 52 is determined not to be a space 56, tab 58, or 
character 60 then the logic flow follows the negative paths to other 
routines for detection and operation. 
As described above, if the signal is determined not to be a reposition 
signal 52 but is determined to be either a space 56, tab 58 or character 
60 the logic branches to the carrier movement routine 62 which will be 
described with respect to FIG. 4. As a result of entering the carrier 
movement routine 62, a decision is made as to whether the position of the 
carrier 13 as a result of the space 56, tab 58 or character 60 command 
will be further to the right than any position previously occupied by the 
print carrier 13 during that typing line 64. If that decision 64 is "no" 
then the logic flow is branched to other routines which are not relevant 
to this invention. 
If the determination 64 is made that the carrier 13 will occupy a position 
to the right of any position previously occupied on that typing line the 
"yes" path is followed 66 and the new carrier position as represented by 
the escapement counter 26 will be stored into the reposition register 48 
(Repo 1 and Repo 2). 
Upon the storage of this position into the reposition register 48, the 
carrier movement routine 62 FIG. 4 for reposition is exited and other 
functions of the typewriter 10 not essential to this invention are 
performed. 
At a later time when the operator enters a reposition command from the 
keyboard 12 by use of the coded function section 46 and the predesignated 
alphanumeric keyboard key 11' of keyboard 12, the reposition routine 54 is 
entered. Upon the entering of the reposition routine command, the logic 
will retrieve 68 or obtain the rightmost carrier position for that typing 
line from the reposition register 48 (Repo 1, Repo 2). Upon the obtaining 
of that information, the information contained therein is utilized as a 
temporary tab stop and the routine effects a tab forward to that position 
70; which is the previous rightmost carrier position in the typing line. 
Upon the commanding of the tabulation function to the temporary tab stop 
location, the routine will then return to start 50 and await further 
commands. 
The embodiment which this invention may take may be in one of several 
alternative forms. One form described above in conjunction with the block 
diagrams and flow charts illustrates one embodiment. An alternative 
embodiment may be an electronic processor control equivalent to the 
elements in electronics 21 which may operate in conjunction with a 
permanently configured read only storage equivalent to reposition logic 42 
and the code representing the flow diagrams in FIGS. 3, 4 and 5 
represented by the instructions of Appendices A-D in which a series of 
instructions and codes may be stored. This electronic apparatus would 
correspond to the apparatus as described in conjunction with FIGS. 1 
through 5. 
In such cases, an alternative to the flow diagrams illustrated in FIGS. 3 
through 5, codes or commands may be stored in the read only storage to 
cause the electronics 21 to process the information from the keyboard 12 
and to control the printer 10 in a predetermined sequence of steps. The 
command and codes stored in the read only storage may take the form of 
those attached in Appendix A and Appendix B. Appendix A is a listing of 
definitions which identify and are associated with particular registers or 
particular bits within a byte and equates those register designations 
and/or bit designations with mnemonics. 
The particular register referred to above may be any storage locations in 
memory in conjunction with the structure of FIG. 6 and are not necessarily 
fixed. 
Appendix B is the complete listing of a set of instructions which serve to 
control the processor equivalent to box 21 and reposition logic 42 and may 
be programed or coded as desired in order to control the electronic 
processor. Particular embodiments of the code or instructions may be 
modified as desired by one skilled in the art to accomplish the particular 
functions of the invention. Additionally, it should be recognized that a 
programable processor may embody a program which may be written conforming 
to the requirements of that processor for accomplishing the same result. 
Referring to Appendix B, Column 1 is the address, in hexadecimal code, 
where that particular instruction is stored in the location designated by 
the corresponding information in Column 1. Column 3 is the mnemonics 
identifying the start point of particular sub-routines. 
Column 4 is the mnemonics for the instruction which the processor then 
executes. Column 5 contains mnemonics which then, through definitions and 
equality statements in Appendix A assigns numerical values for registers 
or bits as appropriate for the instructions contained in Column 4. Column 
6 are explanatory comments. 
Appendix C includes a listing of the instructions, the mnemonics 
representing these instruction and two columns designated respectively 
first byte and second byte having also bit positions indicated 
numerically. 
With reference to those bytes illustrated in the two byte columns, these 
represent how that particular instruction would appear in the read only 
storage memory. The ones and zeros in those bytes are dedicated values 
which remain unchanged for that particular instruction while the B 
contained in the instruction code indicates the bits to be tested and the 
A's are representative of the address to which the instruction series will 
branch upon the meeting of particular conditions set forth, depending upon 
whether the bits B are represented by a one or zero. Referring to other 
instructions, the letter D represents a fixed value in memory and is 
determined by the individual implementing the particular device. 
The R's are representative of the numerical designation for one of 
thirty-two separate registers which are available for storage of data and 
which are available to the processor, the registers being arbitrary 
designations for random storage and not fixed designated registers or 
storage. 
Appendix D includes an instruction summary which lists the mnemonic, the 
name of the instruction represented by the mnemonics and a brief 
description of the function performed by the processor as a result of that 
particular instruction. 
As an aid to understanding the description of the instructions contained in 
Appendix D, a reference should be made to FIG. 6 which is illustrative of 
the flow of the instruction between register 100, memories 102, 104 and 
the accumulator 106. 
While the invention has been particularly shown and described with 
reference to preferred embodiments thereof, it will be understood by those 
skilled in the art that the foregoing and other changes in form and 
details may be made therein without departing from the spirit and scope of 
the invention. 
__________________________________________________________________________ 
APPENDIX A 
__________________________________________________________________________ 
MTARG EQUALS 0 
SUBADDRESS OF PAST CARRIER POSITION 
LTARG EQUALS 1 
ADDRESS OF PAST CARRIER POSITION 
LCNT EQUALS 2 
ADDRESS OF PRESENT CARRIER POSITION 
MINI EQUALS 3 
SUBADDRESS OF PRESENT CARRIER POSITION 
MLCNT EQUALS 4 
MEMORY LINE COUNT, ADDRESS LINE MEMORY 
KBD EQUALS 5 
KEYBOARD REGISTER 
PM EQUALS 6 
PRINTER MAGNET REGISTER, REPRESENTS OUTPUT 
TO PRINTER 
REVMAG EQUALS 1 
REVERSE MAGNET 
SENSOR EQUALS 7 
REGISTER THAT CONTAINS INPUT SENSORS 
EMT EQUALS 2 
EMITTER REPRESENTS ONE UNIT OF ESCAPEMENT 
ECNT EQUALS 8 
UNITS OF ESCAPEMENT REGISTER 
WK1 EQUALS 9 
WORKING REGISTER 
ESCTABL 
EQUALS 100 
TABLE THAT CONTAINS ESCAPEMENT VALUES OF 
CHARACTERS 
VELTABL 
EQUALS 200 
TABLE THAT CONTAINS VELOCITY VALUE OF 
CHARACTERS 
ERTAPE EQUALS 3 
ERASE TAPE LIFT MAGNET 
VELMAG EQUALS 4 
MAGNET THAT SELECTS VELOCITY OF IMT 
CHARMAG 
EQUALS 5 
MAGNET THAT SELECTS CHARACTER 
B1 EQUALS 0 
FIRST BAIL FROM KEYBOARD 
B2 EQUALS 1 
SECOND BAIL FROM KEYBOARD 
B3 EQUALS 2 
THIRD BAIL FROM KEYBOARD 
__________________________________________________________________________ 
__________________________________________________________________________ 
APPENDIX B 
__________________________________________________________________________ 
0000 
8B START LR SENSOR IS THERE AN INPUT FROM KEYBOARD 
0001 
E000 TJN 
STRB,START 
0003 
ABFF LBD 
KBDS 
0005 
BO LN 0 
0006 
05 STR 
KBD 
0007 
ABCC LBD 
X'CC' REPOSITION INPUT? 
0009 
402F CJE 
REPO 
000B 
ABF8 LBD 
X'F8' SE INPUT? 
000D 
401B CJE 
MOVE 
000F 
ABFA LBD 
X'FA' TAB INPUT? 
0011 
401B CJE 
MOVE 
0013 
E01B TJN 
B1,MOVE CHARACTER INPUT? 
0015 
E41B TJN 
B2,MOVE 
0017 
E81B TJN 
B3,MOVE 
0019 
2084 BR OTHERS 
001B 
A6 MOVE LBR 
REPO1 IS THE CARRIER FARTHER TO THE RIGHT 
001C 
82 LR LCNT THAN PREVIOUSLY? 
001D 
6084 CJL 
OTHERS 
001F 
4023 CJE 
CMR2 
0021 
2029 BR CMR1 
0023 
A7 CMR2 LBR 
REPO2 
0024 
83 LR MINI 
0025 
6029 CJL 
CMR1 
0027 
2084 BR OTHERS 
0029 
82 CMR1 LR LCNT UPDATE THE RIGHT MOST CARRIER POSITION 
002A 
06 STR 
REPO1 
002B 
83 LR MINI 
002C 
07 STR 
REPO2 
002D 
2084 BR OTHERS 
002F 
86 REPO LR REPO1 FIND THE RIGHT MOST CARRIER POSITION 
0030 
02 STR 
LCNT 
0031 
09 STR 
WK1 
0032 
87 LR REPO2 
0033 
00 STR 
WK2 
0034 
03 STR 
MINI 
0035 
89 P1 LR WK1 CALCULATE DISTANCE TO TRAVEL BACK 
0036 
AF S1 
0037 
09 STR 
WK1 
0038 
82 LR LCNT 
0039 
AF S1 
003A 
02 STR 
LCNT 
003B 
AB00 LBD 
X'0' WK1 CONTAINS LARGE DISTANCE 
003D 
4041 CJE 
P2 
003F 
2035 BR P1 
0041 
8C P2 LR WK2 
0042 
AE A1 
0043 
AE A1 
0044 
AE A1 
0045 
AE A1 
0046 
AE A1 
0047 
0C STR 
WK2 
0048 
89 LR WK1 
0049 
AF S1 
004A 
09 STR 
WK1 
004B 
8C P3 LR WK2 WK2 CONTAINS SHORT DISTANCE 
004C 
AF S1 
004D 
0C STR 
WK2 
004E 
83 LR MINI 
004F 
AF S1 
0050 
03 STR 
MINI 
0051 
AB00 LBD 
X'0' 
0053 
404B CJE 
P3 
0055 
89 P4 LR WK1 SAVE CALCULATED DISTANCE FOR RETURN 
0056 
0D STR 
WK5 
0057 
8C LR WK2 
0058 
0E STR 
WK6 
0059 
8A LR PM MOVE CARRIER BACKWARD 
005A 
59 SBS 
REVMAG 
005B 
5B SBS 
ESCMAG 
005C 
8B P5 LR SENSOR TRAVEL MINI DISTANCE 
005D 
E85C TJN 
EMT,P5 
005F 
8C LR WK2 
0060 
AF S1 
0061 
0C STR 
WK2 
0062 
AB00 LBD 
X'0' 
0064 
4068 CJE 
P6 
0066 
205C BR P5 
0068 
75 P6 LDL 
5 
0069 
0F STR 
WK3 
006A 
8B P7 LR SENSOR TRAVEL MAXI DISTANCE 
006B 
C86A TJE 
EMT,P7 
006D 
8F LR WK3 
006E 
AF S1 
006F 
0F STR 
WK3 
0070 
AB00 LBD 
X'0' 
0072 
4076 CJE 
P8 
0074 
206A BR P7 
0076 
89 P8 LR WK1 
0077 
AF S1 
0078 
09 STR 
WK1 
0079 
AB00 LBD 
X'0' 
007B 
407F CJE 
P9 
007D 
2068 BR P6 
007F 
8A P9 LR PM TRAVEL FINISHED 
0080 
51 RBS 
REVMAG 
0081 
53 RBS 
ESCMAG 
0082 
2000 BR START 
0084 
AC OTHERS 
H 
__________________________________________________________________________ 
__________________________________________________________________________ 
APPENDIX C 
FIRST BYTE SECOND BYTE 
INSTRUCTION MNEUMONIC 
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 
__________________________________________________________________________ 
TEST BIT - JUMP EQUAL 
TJE 1 1 0 B B B A A A A A A A A A A 
TEST BIT - JUMP NOT EQUAL 
TJN 1 1 1 B B B A A A A A A A A A A 
COME - JUMP EQUAL 
CJE 0 1 0 0 A A A A A A A A A A A A 
COME - JUMP LESS 
CJL 0 1 1 0 A A A A A A A A A A A A 
BRANCH BR 0 0 A A A A A A A A A A A A A A 
LOAD DIRECT LOW LDL 0 1 1 1 D D D D 
LOAD DIRECT HIGH LDH 1 0 1 0 1 0 1 0 D D D D D D D D 
LOAD REGISTER LR 1 0 0 R R R R R 
LOAD INDIRECT LN 1 0 1 1 A A A A 
LOAD B DIRECT LBD 1 0 1 0 1 0 1 1 D D D D D D D D 
STORE REGISTER STR 0 0 0 R R R R R 
STORE INDIRECT STN 1 0 1 0 1 0 0 0 
SET BIT AND STORE 
SBS 0 1 0 1 1 B B B 
RESET BIT AND STORE 
RBS 0 1 0 1 0 B B B 
INCREMENT A1 1 0 1 0 1 1 1 0 
DECREMENT S1 1 0 1 0 1 1 1 1 
NO OPERATION NOP 1 0 1 0 1 1 0 1 
EMITTER ER 1 0 1 0 1 0 0 1 
__________________________________________________________________________ 
______________________________________ 
APPENDIX D 
Instruction Summary 
Mne- 
monic Name Description 
______________________________________ 
TJE B,A 
Test Bit - Test bit B in the accumulator 
Jump Equal and when on, branch to A. 
TJN B,A 
Test Bit - Test bit B in the accumulator 
Jump Unequal 
and when off branch to A. 
CJE R,A 
Compare - Compare byte R in B register 
Jump Equal with accumulator and when 
equal branch to A. 
CJL R,A 
Compare - Compare accumulator to byte 
Jump Low R in B register and when 
accumulator is less than R 
branch to A. 
BR A Branch Branch to A. 
J A Jump Jump to A. 
LDL D Load Direct Load low half of the accumulator 
Low from the instruction. Zero 
high half. 
LDH D Load Direct Load the accumulator from the 
instruction. 
LR R Load Register 
Load accumulator from direct 
memory. Place direct memory 
address in storage address 
Register. 
LBR R Load B Load the B Register from direct 
Register memory. 
LN A Load Indirect 
Load the accumulator from 
indirect memory. (Address 
given by B Register and 4 bits 
of the instruction.) 
STR R Store Register 
Store the accumulator in direct 
memory. Place direct memory 
address. 
STN Store Indirect 
Store the accumulator in indirect 
memory (Address in Register.) 
SBS B Set Bit and Set bit B in direct memory (address 
Store in Storage Address Register) to 1. 
RBS B Reset Bit and 
Set bit B in direct memory (address in 
Store Storage Address Register) to 0. 
A1 Increment Add one to the accumulator. 
S1 Decrement Subtract one from the accumulator. 
NOP No Operation 
Go to next instruction. 
ER Emitter Reset 
Reset Emitter latch. 
______________________________________