IBM System/360 Model 22

IBM System/360 Model 22

Manufacturer	International Business Machines Corporation (IBM)
Product family	System/360
Released	April 7, 1970 (1970-04-07)
Introductory price	$246,000 ($5,600/month) (for the 24K model)
Discontinued	October 7, 1977
Memory	24 or 32K Core
Website	Official website IBM Archives

The IBM System/360 Model 22 was an IBM mainframe from the System/360 line.

History

The Model 22 was a cut-down (economy) version ^{[NB 1]} of the Model 30 computer, aimed at bolstering the low end of the range.

The 360/22 was announced less than a year after the June 22, 1970 ^[1] withdrawal of the 360/30, and it lasted six and a half years, from April 7, 1971, to October 7, 1977.

Comparisons

Model	Announced [2]	Withdrawn [3]	Scientific performance (kIPS) [NB 2]	Commercial performance (kIPS) [NB 3]	CPU Bandwidth (MB/sec) [4]	Memory [NB 4] (model) [NB 5]
22	1971	1977	10	28	1.3	24, 32 [5]
25	1968	1977	9.7	25	1.1	16, 24, 32, 48
30	1964	1970	10.2	29	1.3	8 (C30), 16 (D30), 24 (DC30), [NB 6] 32 (E30), 64 (F30)
40	1964	1970	40	75	3.2	16 (D40), 32 (E40), 64 (F40), 128 (G40), 256 (H40)

Models

Only 2 models were offered: 24K or 32K of memory. ^{[NB 7]}

Notes

1. IBM description: "... small-system economy. It provided an economical way for users to..."
2. Performance calculated (not measured) based on a mix of instructions typical of scientific applications ("Gibson Mix") with the results in kilo Instructions Per Second (kIPS) per Longbottom, Roy. "Computer Speeds From Instruction Mixes - pre-1960 to 1971" . Retrieved October 12, 2014. except for M95 and M195. The latter based upon estimates of performance relative to M65 from Pugh.
3. using commercial instruction mix ("ADP Mix")
4. K=1,024
5. Lower case "M"
6. Note: The DC30 was added in the second/FASTER iteration of the 360/30
7. by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K

References

1. "IBM Archives: System/360 Model 30". IBM. 23 January 2003. Archived from the original on 2023-03-27.
2. Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. ISBN   9780262161237.
3. "System/360 Dates and characteristics". IBM Archives. 23 January 2003. Archived from the original on 2023-04-22.
4. Padegs, A. (September 1981). "System/360 and Beyond". IBM Journal of Research and Development . 25 (5). IBM: 377–390. doi:10.1147/rd.255.0377.
5. "System/360 Model 22". IBM Archives. 23 January 2003. Archived from the original on 2023-04-23.