IBM System/360 Model 22

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

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

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Model	Announced[2]	Withdrawn[3]	Scientific performance (kIPS)[NB 2]	Commercial performance (kIPS)[NB 3]	CPU Bandwidth (MB/sec)[4]	Memory[NB 4] (model)[NB 5]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

1. IBM description: "... small-system economy. It provided an economical way for users to..."
2. 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.
3. using commercial instruction mix ("ADP Mix")
4. K=1,024
5. Lower case "M"
6. Note: The DC30 was added in the second/FASTER iteration of the 360/30
7. by comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K