IBM PC AT Troubleshooting Guide: Revision history

27 September 2026

• curprev 10:4310:43, 27 September 2026 Josh talk contribs 13,884 bytes −1,709 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) undo

16 July 2026

• curprev 13:0613:06, 16 July 2026 Josh talk contribs 15,593 bytes +87 Add representative photo (Wikimedia Commons, attributed on file page) undo
• curprev 00:1600:16, 16 July 2026 Josh talk contribs 15,506 bytes +3,423 Expand troubleshooting: RIFA/tantalum + Dallas/planar battery (161/163) + POST codes; cited undo

21 May 2026

• curprev 11:1811:18, 21 May 2026 Josh talk contribs 12,083 bytes +12,083 Create/rewrite IBM PC AT (5170) and IBM PCjr (4860) page set with verified facts, real images, and embedded content per RTC style guide