AltairZ80: Corrects bug in ICOM floppy device#524
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A hobbyist found an original FDOS for 8" drives (FD360, FD3712) that has turned up a bug in both the FDC+ and AltairZ80 implementation of the FD3712. In the FDC+, the data pointer into the 128 byte write "shift register" is reset upon receipt of a CLEAR command. The real hardware never resets the shift register, so software should not adjust the pointer either. AltairZ80 may need the same adjustment.
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Howdy! I'm committing this to ZIMH, but in the process of doing that, I've noticed there are no Altair integration tests in the repository at all, no attempts to boot and run anything as a smoke test even. Do you have suggestions for an integration test? Like booting an operating system disk I can commit or some such? I don't really know the old S100 machines well. |
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I've committed this on my fork at pmetzger/zimh@5a16b98cb4 and as I said, I would appreciate help setting up an AltairZ80 integration test for the repository. |
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@pmetzger There are test programs for AltairZ80 located here: https://github.com/hharte/altairz80-tests Packages are here: https://github.com/hharte/altairz80-packages |
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@deltecent Thank you so much! I'm importing those into ZIMH now! |
3 participants
A hobbyist found an original FDOS for 8" drives (FD360, FD3712) that has turned up a bug in both the FDC+ and AltairZ80 implementation of the FD3712.
In the FDC+, the data pointer into the 128 byte write "shift register" is reset upon receipt of a CLEAR command. The real hardware never resets the shift register, so software should not adjust the pointer either. AltairZ80 may need the same adjustment.