IBM PS/2 Model 50 Troubleshooting Guide: Revision history

27 September 2026

• curprev 10:3110:31, 27 September 2026 Josh talk contribs 30,887 bytes +16,143 Rebuild the POST tables from Ardent Tool's reproduction of IBM's own symptom/FRU lists: the previous tables mixed PC/AT-era meanings into PS/2 codes and contained codes not in IBM's list; '161 replace Dallas DS12887' was wrong (the Model 50 takes a 6 V pack, FRU 72X8498 - no Dallas module is fitted); correct the beep codes to IBM's five patterns; delete the ECA section (ECA 092 is verifiably the 8570 Data Modification Patch, ECA 087 cannot be corroborated), the unsourced PSU wattage and the S... undo

16 July 2026

• curprev 13:0713:07, 16 July 2026 Josh talk contribs 14,744 bytes +103 Add representative photo (Wikimedia Commons, attributed on file page) undo
• curprev 00:1700:17, 16 July 2026 Josh talk contribs 14,641 bytes +3,423 Expand troubleshooting: RIFA/tantalum + Dallas/planar battery (161/163) + POST codes; cited undo

22 May 2026

• curprev 10:4610:46, 22 May 2026 Josh talk contribs 11,218 bytes +11,218 Split combined PS/2 50/60 and 70/80 pages into per-model pages