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IBM System/360 Model 22 - Wikipedia
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Low-end IBM computer model from 1970s
IBM System/360 Model 22 Manufacturer International Business Machines Corporation (IBM) Product family System/360 Release date April 7, 1970 (1970-04-07) 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
The IBM System/360 Model 22 was an IBM mainframe from the System/360 line.
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.
Model Announced[2] Withdrawn[3] Scientific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)
Only 2 models were offered: 24K or 32K of memory.[NB 7]
- ^ 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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