Editing IBM System/370 (section)

====System/370 Model 155====
{{main article|IBM System/370 Model 155}}

The '''IBM System/370 Model 155''' and the Model 165 were announced Jun 30, 1970, the first of the 370s introduced.<ref>{{cite web|url=https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3155.html|title=System/370 Model 155|website=IBM Archives|date=23 January 2003|publisher=IBM|archive-url=https://web.archive.org/web/20230516082850/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3155.html|archive-date=2023-05-16|url-status=dead}}</ref> Neither had a DAT box; they were limited to running the same non-virtual-memory operating systems available for the [[IBM System/360|System/360]]. The 155 first shipped in January 1971.<ref name="Pugh91" />{{rp|643}}

The ''OS/DOS''<ref>{{cite book
 | title = IBM System/360 Operating System: DOS Emulator Planning Guide
 | id = GC24-5076
 | publisher = IBM
 }}
</ref> (DOS/360 programs under OS/360), ''1401/1440/1460 and 1410/7010''<ref>{{cite book
 | publisher = IBM
 | title = Emulating the IBM 1401, 1440 and 1460 on the IBM System/370 Models 145 and 155 using OS/360 Program Number 360C-EU-735
 | id = GC27-6945-1
 | edition = Second
 | date = February 1971
 | mode = cs2
 }}
</ref><ref>{{cite book
 | publisher = IBM
 | title = Emulating the IBM 1410 and 7010 on the IBM System/370 Models 145 and 155 using OS/360 Program Number 360C-EU-736
 | id = GC27-6946-1
 | edition = Second
 | date = June 1971
 | mode = cs2
 }}
</ref> and ''7070/7074'' <ref>{{cite book
 | publisher = IBM
 | title = Emulating the IBM 7074 on the IBM System/370 Models 155 and 165 using OS/360 Program Number 360C-EU-739
 | id = GC27-6948-1
 | edition = Second
 | date = February 1971
 }}
</ref> compatibility features  were included, and the supporting integrated emulator programs could operate concurrently with standard System/370 workloads.

In August 1972 IBM announced, as a field upgrade only, the '''IBM System/370 Model 155 II''', which added a DAT box.

Both the 155 and the 165 were withdrawn on December 23, 1977.