IBM System/360 Model 22
The IBM System/360 Model 22 was an IBM mainframe from the System/360 line.
 | |
| Manufacturer | International Business Machines Corporation (IBM) |
|---|---|
| Product family | System/360 |
| Release date | April 7, 1970 |
| 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 |
History
The Model 22 was a cut-down (economy) version[NB 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[1] withdrawal of the 360/30, and it lasted six and a half years, from April 7, 1971 to October 7, 1977.
Comparisons
| Model | Announced[2] | Withdrawn[3] | Scientific performance (kIPS)[NB 2] |
Commercial performance (kIPS)[NB 3] |
CPU Bandwidth (MB/sec)[4] |
Memory[NB 4] (model)[NB 5] |
|---|---|---|---|---|---|---|
| 22 | 1971 | 1977 | 10 | 28 | 1.3 | 24, 32 [5] |
| 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),[NB 6] 32 (E30), 64 (F30) |
| 40 | 1964 | 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.[NB 7]
Notes
- IBM description: "... small-system economy. It provided an economical way for users to..."
- 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.
- using commercial instruction mix ("ADP Mix")
- K=1,024
- Lower case "M"
- Note: The DC30 was added in the second/FASTER iteration of the 360/30
- by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K
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References
- "IBM Archives: System/360 Model 30". IBM.
- Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT.
- "IBM Archives: System/360 Dates and characteristics". IBM.
- 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.
- "IBM System/360 Model 22". IBM.
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