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==System software==
It was possible to choose [[DOS/360]], [[OS/360 and successors#MFT|OS/360 MFT]] (Multi-programming with a Fixed number of Tasks), or [[OS/360 and successors#MVT|OS/360 MVT]] (Multi-programming with a Variable number of Tasks) as the [[operating system]] of an IBM System/360 Model 50. Few chose MVT.<ref name="most-didnt-run-mvt">{{cite mailing list|url=https://groups.google.com/forum/#!original/bit.listserv.ibm-main/zqAApnIeXec/qZ-fhTcVKz0J|title=the console subsystem priority |via=Google Groups |date=January 18, 2004|author=William H. Blair|mailing-list=ibm-main|quote=Your point is well taken. But most didn't run MVT, and many that did had LCS (Large Capacity Storage). MVT was not very popular. Nonetheless, I ran a system that ran MVT just fine with only 256MB; maximum REGION size was 114MB, which was perfectly fine for the workload. I suspect that if MVT was being used on a /65 or /75, then 512KB was installed. But, there were a lot of folks that ran MVT on a /50 with 384KB. We got blood out of the turnip back in those days. |url-status=live |archive-url=https://archive.
The choice of operating system for the System/360 Model 50 was based primarily on the amount of main storage. The F50, with 65,536 bytes of main storage, can not run OS/MFT, which requires a minimum of 131,072 bytes of main storage.<ref>{{cite book|url=http://bitsavers.org/pdf/ibm/360/os/R21.7_Apr73/GC27-6939-10_MFT_Guide_R21.7_Mar72.pdf|title=IBM System/360 Operating System: MFT Guide OS Release 21.7|id=GC27-6939-10|publisher=IBM|date=March 1972|page=69 |via=bitsavers |url-status=live |archive-url= https://web.archive.org/web/20231224064716/http://bitsavers.org/pdf/ibm/360/os/R21.7_Apr73/GC27-6939-10_MFT_Guide_R21.7_Mar72.pdf |archive-date= Dec 24, 2023 }}</ref>
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