History of IBM CKD Controllers
Chronological summary

History of IBM CKD Controllers

Section Title: Chronological summary
Table Section Text: None

Controller Manual	Announcement Date	Comment

2820 SCU	A22-6895	4/7/1964	similar to 2841 with parallel read channels

2841 SCU	A26-5988-0	4/7/1964

2314 DASF	A26-3599	4/23/1965	Bundled SCU with 9 drives, similar to 2841

System 360 Model 25 DAC	A24-3510	1/4/1968

2314-A1 SCU	A26-3599	9/1969 est.	Unbundled 2314 DASF, SCU similar to 2841

2844 Aux SCU with 2314	A26-3599	1968 est.	provides dual path, similar to 2841

2835-1,2 SCUs	GA26-1589	1/28/1970	similar to 3830-1 with parallel read channels

3830-1 SCU	GA26-1592	6/30/1970

System 370 Model 145 IFA	A26-3599	9/23/1970

2314-B1 SCU	A26-3599	12/14/1970	For 2319B DASD, similar to 2841

3830-2 SCU	GA26-1617	Aug 1972	single director

Integrated Storage Control Unit	GA26-1620	8/2/1972	A repackaged 3830-2

S/370 125-0, -2 3330/3333 Direct Disk Attachment	10/4/1972

S/370 115-0, -2, 125-0, -2 3340/3344 Direct Disk Attachment	GA33-1506	3/17/1973

3830-3 SCU and Integrated Storage Controller with Staging Adapter	GA32-0036	10/9/1974	single director, used with 3850 MSS

S/370 138 Integrated File Adapter	GA24-3632	6/30/1976

4321/4331 DASD Adapter for 3340/3344	GA33-1526	1/30/1979

3880-1, 2, 3 SCU	GA26-1661	6/1/1980	dual director

3880-11, 13 SCU	GA32-0061	10/21/1981	dual directors, large cache

3880-4 SCU	GA26-1661	1983	For reference only, NOT a CKD director

4361 DASD Adapter for 3340/3344	GA33-1566	9/10/1984

3880-21, 23 SCU	GA32-0081	10/18/1984	dual directors, large cache

3380-CJ2 Direct Chanel Attached DASD	GC26-4497	9/1/1987	An SCU and two DASD in one unit; additional DASD can be attached

3990-1,2,3 SCUs	GA32-0099	11/14/1989	dual directors, model 3 has cache

3990-6 SCU	GA32-0274	5/19/1993	dual caching directors

Sentence(s)

Models 3880-11, 3880-13, 3880-21, and 3880-23 have dual directors.

final_sentence: Models 3880-11, 3880-13, 3880-21, and 3880-23 have dual directors.