Editing IBM System/370 (section)

===Models sorted by date introduced (table)===
The following table summarizes the major S/370 series and models. The second column lists the principal architecture associated with each series. Many models implemented 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]], 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 manufacturer]]s (PCMs), because they competed aggressively against IBM hardware dominance.

{| class="wikitable"
! First year<br />of series !! Architecture !! Market<br />level !! Series !! Models 
|-
| 1970 || System/370 (no DAT) || high-end || rowspan="5" | System/370-xxx || -155, -165, -195
|-
| 1970 || System/370 (DAT) || mid-range || -145<ref name="model145">{{cite web|url=https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3145.html|title=System/370 Model 145|website=IBM Archives|date=23 January 2003|publisher=IBM|archive-url=https://web.archive.org/web/20230729090334/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3145.html|archive-date=2023-07-29|url-status=dead}}</ref> and -135
|-
| rowspan="3" | 1972 || rowspan="3" | System/370 || high-end || -158 and -168
|-
| entry || -115 and -125
|-
| mid-range || -138 and -148
|-
| 1977 || rowspan="3" | System/370-compatible<ref>{{cite web|url=http://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_basinfo.html|title=IBM timeline of S/370 series| website=[[IBM]] |date=23 January 2003}} with surprising term 'System/370-compatible' for the 3xxx and 4xxx series</ref> || high-end || [[IBM 303X|303x]] || 3031, 3032, 3033
|-
| 1979 || entry/mid || [[IBM 4300|43xx]] || 4331, 4341, 4361
|-
| 1980 || rowspan="2" | high-end || rowspan="2" | [[IBM 308X|308x]] || rowspan="2" | 3081, 3083, 3084
|-
| 1981 || rowspan="3" | System/370-XA
|-
| 1983 || mid-range || [[IBM 4300|4381]] || 4381
|-
| 1986 || high-end || [[IBM 3090|3090]] || -120 to -600
|-
| 1986 || System/370-compatible<ref>{{cite web|url=https://www.ibm.com/docs/en/announcements/archive/ENUS186-178|title=IBM 9370 Information System Overview|type=Announcement letter|publisher=[[IBM]] |date=7 October 1986}} to explain why the 9370 is categorized as a System/370 compatible system
</ref> || entry || [[IBM 9370|937x]] || 9370, ...
|-
| 1988 || rowspan="2" | ESA/370 || high-end || ES/3090 || ES/3090
|-
| 1988 || mid-range || ES/4381 || -90, -91, -92 
|}