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IBM Cassette BASIC: Revision history

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23 September 2026

  • curprev 03:4003:40, 23 September 2026 Josh talk contribs 7,191 bytes +206 Add illustration of the Cassette BASIC start-up screen undo
  • curprev 03:2303:23, 23 September 2026 Josh talk contribs 6,985 bytes +4,870 Corrected the claim that Cassette BASIC was dropped from the PCjr - IBM's own PCjr Technical Reference says it is in system ROM, with Cartridge BASIC adding Advanced BASIC; added the 5170's U27/U47 location and C1.00/C1.10 versions; replaced the vague 'reseat and swap' fault note with the per-BIOS-revision symptom table including the Fx00 ROM messages; added ROM pinout/substitution notes; removed the unverifiable PS/2 claim and said so plainly; <ref>-cited undo

21 May 2026

  • curprev 10:2510:25, 21 May 2026 Josh talk contribs 2,115 bytes −772 Rewrite with verified information only — remove fabricated part numbers (CGA 1501486, MDA 1501481, FDD Adapter 1501507, Fixed Disk Adapter 6181682, Model F dimensions/weight), remove placeholder image filenames, replace speculative capacitor designator table with verified minuszerodegrees.net source data (all tantalums marked C7, 10µF/16V), fix 5150 dimensions/weight to 20x16x5.5 inches / 21-28 lbs, fix Model F dimensions/weight to 19x9x1.5in / 7lb4oz / 3.3kg. Per Joshua's feedback: never pub... undo
  • curprev 10:0310:03, 21 May 2026 Josh talk contribs 2,887 bytes +2,887 Create supporting page for the IBM PC (5150) article series
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