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IBM 3270 PC Maintenance Guide: Revision history

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24 September 2026

  • curprev 22:0422:04, 24 September 2026 Josh talk contribs 14,810 bytes +241 Add lead image; point the XT maintenance link at the page that exists undo
  • curprev 22:0322:03, 24 September 2026 Josh talk contribs 14,569 bytes +6,027 Fix refs so they render; correct BNC twinax and the 75-ohm terminator - it is coax, point to point, no terminator, and IBMs check is <1 ohm at the system unit connector; Model F has no foam pads (capacitive flyplate, not foam and foil); add IBMs coax isolation procedure, the error-code to FRU map, the false 2801 (ECA001, P/N 1497249) and false 8505; remove the unsourced 12-15 kV figure undo

23 May 2026

  • curprev 22:3222:32, 23 May 2026 Josh talk contribs 8,542 bytes +8,542 Deep technical XT/370 + 3270 PC family page with verified sources (IBM SA38-0037-00 Service Info Manual, IBM GA33-3141-0, IBM 1502336, Kozuh/Livingston/Spillman IBM Systems Journal 1984, seasip.info, Wikipedia)
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