IBM System/360 Model 30: Difference between revisions

Revision as of 16:05, 5 December 2018

Revision as of 19:59, 5 December 2018

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* '''DOS''' - Disk Operating System

BPS [[IBM Basic Programming Support|(Basic Programming Support)]] did not require a disk drive or even a tape drive. It was introduced in 1965, and has been described<ref name="DeMorton">{{cite web|url=http://www.demorton.com/Tech/$OSTL.pdf|title=IBM Mainframe Operating Systems: Timeline and Brief Explanation For the IBM System/360 and Beyond|author=Dave Morton|date=April 2015}}</ref> as "primarily a set of utilities and compilers (that) existed on cards only."<ref name="DeMorton"/>{{rp|pages 10,18}}

BOS [[BOS/360|(Basic Operating System)]] required a disk drive, but, like BPS, could run on the smallest 360/30, the 8K model C30.<ref name="BOS_ProGuide"/>{{rp|pp.9,10}}

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The minimum memory needed to run DOS or TOS was 16&nbsp;KB.

TOS [[TOS/360|(Tape Operating System)]], as the name suggests, required a tape drive but no disk. It shared most of the code base<ref name=40Y.mem>{{cite newsgroup|url=https://groups.google.com/d/msg/alt.folklore.computers/RZA6FD27Tc0/-LoIXsOee7gJ|title=DOS/360: Forty years|author=Joe Morris|newsgroup=alt.folklore.computer|date=April 25, 2005|quote=Don't forget TOS, the bastard cousin of DOS. Either could be generated from the same set of distribution libraries...}}</ref> and some manuals<ref>{{cite web|url=http://www.bitsavers.org/pdf/ibm/360/dos/GC24-5030-8_Disk_and_Tape_Operating_Systems_Concepts_and_Facilities_Oct70.pdf|title=IBM System/360 Disk and Tape Operating Systems Concepts and Facilities|date=October 1970|id=GC2ij-5030-8}}</ref><ref>{{cite web|url=http://www.bitsavers.org/pdf/ibm/360/dos/GC24-3465-8_DOS_and_TOS_Utility_Programs_R26.1_Aug73.pdf|title=DOS and TOS Utility Programs|date=August 1973|id=GC24-3465-8}}</ref> with IBM's DOS/360 and went through 14 releases. TOS was discontinued<ref>https://www.mail-archive.com/ibmvm (at) listserv.uark.edu/msg24371.html</ref> when disk drives became more affordable.<ref>Computerworld,Sept.5,1977,p.40 - quotes an IBM task force report that referred to "price alone rather than by price/performance."</ref>

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>