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IBM System/360 Model 22

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

Line position

It was a cut-down (economy) version of the Model 30 computer, aimed at bolstering the low end of the range.

The Model 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 [2]

Comparisons

Model Announced[3] Withdrawn[4] Scientific
performance
(kIPS)[5] 		Commercial
performance
(kIPS)[6] 		CPU
Bandwidth
(MB/sec)[7] 		Memory[8] (model)[9]
22 1971 1977 10 28 1.3 24, 32 [10]
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),[11]
32 (E30), 64 (F30)
40 1964 1970 40 75 3.2 16 (D40), 32 (E40), 64 (F40),
128 (G40), 256 (H40)

References

  1. ^ "IBM Archives: System/360 Model 30". IBM.
  2. ^ the half year's six months was from the 7th of April thru the 7th of October; see "Comparisons" table for years.
  3. ^ Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. {{cite book}}: Explicit use of et al. in: |last= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
  4. ^ ibm.com/ibm/history/exhibits/mainframe/ ...
  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. ^ Ibid, using commercial instruction mix ("ADP Mix")
  7. ^ 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.
  8. ^ K=1,024
  9. ^ Lower Case "M"
  10. ^ "IBM System/360 Model 22". IBM.
  11. ^ Note: The DC30 was dropped in the second/SLOWER iteration of the 360/30


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