IBM System/360 Model 22

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IBM logo.svg
Manufacturer International Business Machines Corporation (IBM)
Product family System/360
Release date 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[edit]

The Model 22 was a cut-down (economy) version[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[2] withdrawal of the 360/30, and it lasted six and a half years, from April 7, 1971 to October 7, 1977.

Comparisons[edit]

Model Announced[3] Withdrawn[4] Scientific
performance
(kIPS)[5]
Commercial
performance
(kIPS)[6]
CPU
Bandwidth
(MB/sec)[7]
Memory[8] (model)[NB 1]
22 1971 1977 10 28 1.3 24, 32 [9]
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),[10]
32 (E30), 64 (F30)
40 1964 1970 40 75 3.2 16 (D40), 32 (E40), 64 (F40),
128 (G40), 256 (H40)

Models[edit]

Only 2 models were offered: 24K or 32K of core memory.[11]

Notes[edit]

  1. ^ Lower case "M"

References[edit]

  1. ^ IBM description: "... small-system economy. It provided an economical way for users to..."
  2. ^ "IBM Archives: System/360 Model 30". IBM. 
  3. ^ Pugh et. al., Emerson (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. 
  4. ^ "IBM Archives: System/360 Dates and characteristics". IBM. 
  5. ^ 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.
  6. ^ using commercial instruction mix ("ADP Mix")
  7. ^ 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. 
  8. ^ K=1,024
  9. ^ "IBM System/360 Model 22". IBM. 
  10. ^ Note: The DC30 was added in the second/FASTER iteration of the 360/30
  11. ^ by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K