IBM 3270 PC Troubleshooting Guide: Revision history

27 September 2026

• curprev 10:4410:44, 27 September 2026 Josh talk contribs 12,613 bytes −7 Fix red link: the page is IBM PC XT Troubleshooting Guide undo
• curprev 10:4310:43, 27 September 2026 Josh talk contribs 12,620 bytes −542 Structural and content repair: remove emoji from section headings; merge the duplicated References section (the trailing bare bullet list is now named inline refs); de-duplicate the tripled/quadrupled ref definitions that produced visible cite errors; rewrite the bolted-on power-supply and CMOS blocks so they describe this machine (the Dallas DS1287/DS12887 claim and, where applicable, the PC/XT minimum-load sentence did not apply here); correct the generic POST note - 161/163 cannot occur on... undo

16 July 2026

• curprev 13:0013:00, 16 July 2026 Josh talk contribs 13,162 bytes +91 Add representative photo (Wikimedia Commons, attributed on file page) undo
• curprev 00:1600:16, 16 July 2026 Josh talk contribs 13,071 bytes +3,571 Expand troubleshooting: RIFA PSU cap + tantalum shorts (+ POST beep codes); cited (minuszerodegrees/classic-computers) undo

23 May 2026

• curprev 22:3222:32, 23 May 2026 Josh talk contribs 9,500 bytes +9,500 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)