IBM System/360 Model 22

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

IBM System/360 Model 22
ManufacturerInternational Business Machines Corporation (IBM)
Product familySystem/360
Release dateApril 7, 1970 (1970-04-07)
Introductory price$246,000 ($5,600/month)
(for the 24K model)
DiscontinuedOctober 7, 1977
Memory24 or 32K Core
WebsiteOfficial website IBM Archives

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Model Announced[2] Withdrawn[3] Scientific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.
  2. Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. ISBN 9780262161237.
  3. "IBM Archives: System/360 Dates and characteristics". IBM. 23 January 2003.
  4. Padegs, A. (September 1981). "System/360 and Beyond". IBM Journal of Research and Development. IBM. 25 (5): 377–390. doi:10.1147/rd.255.0377.
  5. "IBM System/360 Model 22". IBM. 23 January 2003.
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