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| data-sort-type="number" | Model | data-sort-type="number" | Announced[3] | data-sort-type="number" | Withdrawn[4] | data-sort-type="number" | Scientific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] |
|---|
| 22 | data-sort-value="1971" | 1971 | data-sort-value="1977" | 1977 | 10 | 28 | 1.3 | 24, 32 [10] |
| 25 | data-sort-value="1968" | 1968 | data-sort-value="1977" | 1977 | 9.7 | 25 | 1.1 | 16, 24, 32, 48 |
| 30 | data-sort-value="1964" | 1964 | data-sort-value="1970" | 1970 | 10.2 | 29 | 1.3 | 8 (C30), 16 (D30), 24 (DC30),[11]
32 (E30), 64 (F30) |
| 40 | data-sort-value="1964" | 1964 | data-sort-value=""1970" | 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.[12]
Notes and References
- IBM description: "... small-system economy. It provided an economical way for users to..."
- 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.
- 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 .
- 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.
- 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.
- using commercial instruction mix ("ADP Mix")
- Padegs . A. . September 1981 . System/360 and Beyond . . 10.1147/rd.255.0377 . IBM . 25 . 5 . 377–390 .
- K=1,024
- Lower case "M"
- 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.
- Note: The DC30 was added in the second/FASTERiteration of the 360/30
- by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K
