File:IBM Options and Adapters - IBM PC 20MB Fixed Disk Drive Adapter.pdf
IBM, IBM Personal Computer 20MB Fixed Disk Drive Adapter, part 6139790, 17 March 1986, Options and Adapters section, Personal Computer Hardware Reference Library.
IBM's own technical reference for the later switch-selectable variant of the IBM Fixed Disk Adapter: the four supported drive types with their cylinder, head, write-precompensation start and landing-zone figures, the switch settings that select a type for drive 0 and drive 1, the status and sense byte definitions, the command set, the connector specifications, the logic diagrams, and the adapter's own BIOS listing.
Source: scanned by Ray Cunningham and published in the IBM Options and Adapters section of minuszerodegrees.net. Hosted here so that the repair guides on this wiki can cite a copy that will not disappear.
IBM published this manual as part of the Personal Computer Hardware Reference Library; it is reproduced here for the benefit of people maintaining surviving machines. IBM retains copyright.
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| current | 03:15, 23 September 2026 | 0 × 0 (2.06 MB) | Josh (talk | contribs) | IBM Options and Adapters technical reference section, for citation by the IBM peripheral pages |
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