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IBM System/23 Datamaster Troubleshooting Guide: Revision history

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24 September 2026

  • curprev 22:1522:15, 24 September 2026 Josh talk contribs 17,606 bytes +4,574 Fix refs so they render; replace the PID-1200 table with IBMs own index of routines including the critical/not-critical column - codes 36 to 3E are NOT critical so the machine does not halt on them; add the display-attribute meanings, the pre-CRT hardware error latches, the TRAP rule (fault is in the routine AFTER the last displayed), the 25-35 s run time and the two CE jumpers undo

16 July 2026

23 May 2026

  • curprev 17:4917:49, 23 May 2026 Josh talk contribs 12,915 bytes +12,915 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)
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