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DOS [[DOS/360|(Disk Operating System)]] was a popular choice for the 360/30.<ref>Of those 360/30 and 360/40 machines still around in 1981/being replaced by 4300 systems, a Computerworld survey showed that DOS was what they ran/had run, May 25, 1981, p. 26</ref><ref>{{cite web|url=http://www.edwardbosworth.com/My3121Textbook_HTM/MyText3121_Ch03_V01.htm|title=Programming Assembler Language on the IBM Mainframes: An Introduction|at=Chapter 3 – The Heritage of the IBM System/360|author=Edward L. Bosworth}}</ref><ref>{{cite web|url=http://ed-thelen.org/comp-hist/ibm-360-30.html|title=IBM System 360, Model 30|author=Ed Thelen}}</ref><ref>{{cite web|url=http://www.highersystems.co.uk/ibm_360_30.html|title=IBM 360/30}}</ref>
Amazingly<ref group='NB'>The source cited prefixes its statement with "Amazing fact:"</ref> the smaller BOS had a [[Spooling]] system for queued printing, whereas DOS did not<ref name="DeMorton"/>{{rp|page 18}} until the arrival in the late 1960s of "an add-on component called POWER."<ref name="DeMorton"/>{{rp|page 16}}
==Programming languages==
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