IBM System/23 Datamaster Troubleshooting Guide: Difference between revisions

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[[File:IBM System-23 Datamaster (photo).jpg|thumb|right|300px|IBM System/23 Datamaster. Source: Wikimedia Commons.]]

This guide documents fault diagnosis for the '''[[IBM System/23 Datamaster]]''' (machine types 5322 and 5324). The Datamaster's POST is called '''PID-1200''' and is the '''direct architectural ancestor of the IBM PC's POST''' — David Bradley (who wrote both diagnostics) confirms in his 1990 ''BYTE'' retrospective: "the diagnostics system was ported to the PC and simplified, and was renamed to POST."<ref>Bradley, D. J. "The Creation of the IBM PC", ''BYTE'' September 1990.</ref> PID-1200 is unusually well-documented for an 8-bit micro because it was published in '''IBM System/23 Diagnostic User Guide 6841631''' (April 1982).<ref>http://bitsavers.org/pdf/ibm/system23/fe/6841631_System_23_Diagnostic_User_Guide_Apr82.pdf</ref>

Revision as of 17:49, 23 May 2026 edit Josh (talk \| contribs) Bureaucrats, Interface administrators, Moderators, Suppressors, Administrators 6,546 edits Deep technical IBM System/23 Datamaster page with verified sources (SY34-0171-0 Service Manual, 6841631 Diagnostic Guide, Bradley BYTE Sep 1990, Bits Passats community reference)		Latest revision as of 13:07, 16 July 2026 edit undo Josh (talk \| contribs) Bureaucrats, Interface administrators, Moderators, Suppressors, Administrators 6,546 edits Add representative photo (Wikimedia Commons, attributed on file page)
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			[[File:IBM System-23 Datamaster (photo).jpg\|thumb\|right\|300px\|IBM System/23 Datamaster. Source: Wikimedia Commons.]]
	This guide documents fault diagnosis for the '''[[IBM System/23 Datamaster]]''' (machine types 5322 and 5324). The Datamaster's POST is called '''PID-1200''' and is the '''direct architectural ancestor of the IBM PC's POST''' — David Bradley (who wrote both diagnostics) confirms in his 1990 ''BYTE'' retrospective: "the diagnostics system was ported to the PC and simplified, and was renamed to POST."<ref>Bradley, D. J. "The Creation of the IBM PC", ''BYTE'' September 1990.</ref> PID-1200 is unusually well-documented for an 8-bit micro because it was published in '''IBM System/23 Diagnostic User Guide 6841631''' (April 1982).<ref>http://bitsavers.org/pdf/ibm/system23/fe/6841631_System_23_Diagnostic_User_Guide_Apr82.pdf</ref>		This guide documents fault diagnosis for the '''[[IBM System/23 Datamaster]]''' (machine types 5322 and 5324). The Datamaster's POST is called '''PID-1200''' and is the '''direct architectural ancestor of the IBM PC's POST''' — David Bradley (who wrote both diagnostics) confirms in his 1990 ''BYTE'' retrospective: "the diagnostics system was ported to the PC and simplified, and was renamed to POST."<ref>Bradley, D. J. "The Creation of the IBM PC", ''BYTE'' September 1990.</ref> PID-1200 is unusually well-documented for an 8-bit micro because it was published in '''IBM System/23 Diagnostic User Guide 6841631''' (April 1982).<ref>http://bitsavers.org/pdf/ibm/system23/fe/6841631_System_23_Diagnostic_User_Guide_Apr82.pdf</ref>