IBM System/360 Model 22

IBM System/360 Model 22
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

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Model	Announced^[2]	Withdrawn^[3]	Scientific performance (kIPS)^{[NB 2]}	Commercial performance (kIPS)^{[NB 3]}	CPU Bandwidth (MB/sec)^[4]	Memory^{[NB 4]} (model)^{[NB 5]}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

References

^ "IBM Archives: System/360 Model 30". IBM. 23 January 2003.
^ Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. ISBN 9780262161237.
^ "IBM Archives: System/360 Dates and characteristics". IBM. 23 January 2003.
^ 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.
^ "IBM System/360 Model 22". IBM. 23 January 2003.

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

[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.

[6] using commercial instruction mix ("ADP Mix")

[8] K=1,024

[9] Lower case "M"

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

[12] y comparison, the initial offering of the 360/30 included FOUR models: 8K, 16K, 32K, 64K

[Arch22-2] "IBM Archives: System/360 Model 30". IBM. 23 January 2003.

[Pugh360-3] Pugh, Emerson; et al. (1991). "Appendix A - System Introduction Dates 1964-1977". IBM's 360 and Early 370 Systems. MIT. ISBN 9780262161237.

[4] "IBM Archives: System/360 Dates and characteristics". IBM. 23 January 2003.

[Padegs-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.

[10] "IBM System/360 Model 22". IBM. 23 January 2003.

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