Series and Models
The following table summarizes the major S/370 series and models. The second column lists the principal architecture associated with each series. Many models supported more than one architecture; thus, 308x processors initially shipped as S/370 architecture, but later offered XA; and many processors, such as the 4381, had microcode that allowed customer selection between S/370 or XA (later, ESA) operation.
Note also the confusing term "System/370-compatible", which appeared in IBM source documents to describe certain products. Outside IBM, this term would more often describe systems from Amdahl Corporation, Hitachi Ltd., and others, that could run the same S/370 software. This choice of terminology by IBM may have been a deliberate attempt to ignore the existence of those plug compatible manufacturers (PCMs), because they competed aggressively against IBM hardware dominance.
| First year of series |
Architecture | Market level |
Series | Models |
|---|---|---|---|---|
| 1970 | System/370 (no DAT) | high-end | System/370-xxx | -155, -165, -195 |
| 1970 | System/370 (DAT) | mid-range | -145 and -135 | |
| 1972 | System/370 | high-end | -158 and -168 | |
| entry | -115 and -125 | |||
| mid-range | -138 and -148 | |||
| 1977 | System/370-compatible | high-end | 303x | 3031, 3032, 3033 |
| 1979 | entry/mid | 43xx | 4331, 4341, 4361 | |
| 1980 | high-end | 308x | 3081, 3083, 3084 | |
| 1981 | System/370-XA | |||
| 1983 | mid-range | 4381 | 4381 | |
| 1986 | high-end | 3090 | -120 to -600 | |
| 1986 | System/370-compatible | entry | 937x | 9370, ... |
| 1988 | ESA/370 | high-end | ES/3090 | ES/3090 |
| 1988 | mid-range | ES/4381 | -90, -91, -92 |
Notable machines in the 370 range include the IBM 370/195, the IBM 370/168, the IBM 3033, the IBM 3090 mainframe/supercomputer with its optional vector facility (VF) extension, and the relatively inexpensive IBM 9370 tailored for small-to-medium size businesses.
Read more about this topic: IBM System/370
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