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IBM System/23 Datamaster Maintenance Guide: Revision history

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24 September 2026

  • curprev 22:1522:15, 24 September 2026 Josh talk contribs 18,800 bytes +240 Add lead image undo
  • curprev 22:1522:15, 24 September 2026 Josh talk contribs 18,560 bytes +4,661 Fix refs so they render; the supply is ferroresonant with an 800 Vac DANGER notice, not linear with series-pass regulators; replace the invented symmetric rail table with IBMs tolerances, ripple limits and fuse ratings; add IBMs meter-and-capacitor ripple method and the service-position grounding check; CRT size settled at 12 in from IBMs manual; remove the unsourced 12-15 kV anode figure; add the diskette motor run capacitor discharge warning undo

23 May 2026

  • curprev 17:4917:49, 23 May 2026 Josh talk contribs 13,899 bytes +13,899 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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