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Make the DOSVER function call return 6Fh in C in DOS 1 mode #128

Merged
merged 1 commit into from Nov 30, 2023
Merged

Make the DOSVER function call return 6Fh in C in DOS 1 mode #128

merged 1 commit into from Nov 30, 2023

Commits on Oct 28, 2023

  1. Make the DOSVER function call return 6Fh in C in DOS 1 mode 

    The MSX-DOS 2 documentation says that DOSVER in DOS 1 returns B=0
and C undefined, but the fact is that in MSX-DOS 1 register C is
preserved (so 6Fh) and seems like some programs rely on that fact
to detect the DOS 1 mode. Nextor was corrupting C in this case,
so even if strictly speaking that shouldn't be an issue, this commit
changes the behavior of DOSVER in DOS 1 to return C=6Fh.
    @Konamiman
    Konamiman committed Oct 28, 2023
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