Menu
Home Explore People Places Arts History Plants & Animals Science Life & Culture Technology
On this page
IBM System/360 Model 22
Low-end IBM computer model from 1970

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

Related Image Collections Add Image
Profiles
1 Image
We don't have any YouTube videos related to IBM System/360 Model 22 yet.
We don't have any PDF documents related to IBM System/360 Model 22 yet.
We don't have any Books related to IBM System/360 Model 22 yet.
We don't have any archived web articles related to IBM System/360 Model 22 yet.

History

The Model 22 was a cut-down (economy) version1 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, 19702 withdrawal of the 360/30, and it lasted six and a half years, from April 7, 1971, to October 7, 1977.

Comparisons

ModelAnnounced3Withdrawn4Scientificperformance(kIPS)5Commercialperformance(kIPS)6CPUBandwidth(MB/sec)7Memory8 (model)9
221971197710281.324, 32 10
25196819779.7251.116, 24, 32, 48
301964197010.2291.38 (C30), 16 (D30), 24 (DC30),11 32 (E30), 64 (F30)
401964197040753.216 (D40), 32 (E40), 64 (F40), 128 (G40), 256 (H40)

Models

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

Notes

References

  1. IBM description: "... small-system economy. It provided an economical way for users to..." ↩

  2. "IBM Archives: System/360 Model 30". IBM. 23 January 2003. Archived from the original on 2023-03-27. https://web.archive.org/web/20230327055011/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2030.html ↩

  3. Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. ISBN 9780262161237. 9780262161237 ↩

  4. "System/360 Dates and characteristics". IBM Archives. 23 January 2003. Archived from the original on 2023-04-22. https://web.archive.org/web/20230422131739/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_FS360.html ↩

  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. /wiki/Gibson_Mix ↩

  6. 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. /wiki/IBM_Journal_of_Research_and_Development ↩

  8. K=1,024 ↩

  9. Lower case "M" ↩

  10. "System/360 Model 22". IBM Archives. 23 January 2003. Archived from the original on 2023-04-23. https://web.archive.org/web/20230423095416/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2022.html ↩

  11. Note: The DC30 was added in the second/FASTER iteration of the 360/30 ↩

  12. by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K /wiki/IBM_System/360_Model_30 ↩