IBM System/360 Model 22 explained

IBM System/360 Model 22
IBM System/360 Model 22
Manufacturer:International Business Machines Corporation (IBM)
Family:System/360
Price:$246,000 ($5,600/month)
(for the 24K model)
Discontinued:October 7, 1977
Memory:24 or 32K Core
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[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

data-sort-type="number"Modeldata-sort-type="number"Announced[3] data-sort-type="number"Withdrawn[4] data-sort-type="number"Scientific
performance
(kIPS)[5]
data-sort-type="number"Commercial
performance
(kIPS)[6]
CPU
Bandwidth
(MB/sec)[7]
Memory[8] (model)[9]
22data-sort-value="1971"1971data-sort-value="1977"197710281.324, 32 [10]
25data-sort-value="1968"1968data-sort-value="1977"19779.7 251.116, 24, 32, 48
30data-sort-value="1964"1964data-sort-value="1970"197010.2 291.38 (C30), 16 (D30), 24 (DC30),[11]
32 (E30), 64 (F30)
40data-sort-value="1964"1964data-sort-value=""1970"197040 753.216 (D40), 32 (E40), 64 (F40),
128 (G40), 256 (H40)

Models

Only 2 models were offered: 24K or 32K of memory.[12]

Notes and References

  1. IBM description: "... small-system economy. It provided an economical way for users to..."
  2. Web site: IBM Archives: System/360 Model 30. IBM. 23 January 2003. https://web.archive.org/web/20230327055011/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2030.html. 2023-03-27. dead.
  3. Book: Pugh, Emerson . etal . IBM's 360 and Early 370 Systems . 1991 . MIT . Appendix A - System Introduction Dates 1964-1977 . 9780262161237 . https://books.google.com/books?id=MFGj_PT_clIC&q=pugh+Appendix+A+%22system+introduction+dates%22&pg=PA643 .
  4. Web site: System/360 Dates and characteristics. IBM Archives. 23 January 2003. https://web.archive.org/web/20230422131739/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_FS360.html. 2023-04-22. dead.
  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 Web site: Computer Speeds From Instruction Mixes - pre-1960 to 1971. Longbottom. Roy. 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 . . 10.1147/rd.255.0377 . IBM . 25 . 5 . 377–390 .
  8. K=1,024
  9. Lower case "M"
  10. Web site: System/360 Model 22. 23 January 2003. IBM Archives. https://web.archive.org/web/20230423095416/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2022.html. 2023-04-23. dead.
  11. Note: The DC30 was added in the second/FASTERiteration of the 360/30
  12. by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K