Hello Arkady,
> MS-DEBUG doesn't runs from FD because "Incorrect DOS version". Setting
> required through VERSION= doesn't helps. Analyzing of inthndlr.c shows, that
> os_major and os_minor returned only through INT21/3306, for INT21/30 used
> os_setver_*. Is this bug (in config.c:sysVersion(), which not sets
> os_setver_*)?
RBIL:
INT 21 - DOS 5+ - GET TRUE VERSION NUMBER
AX = 3306h
Return: BL = major version
BH = minor version
DL = revision (bits 2-0, all others 0)
DH = version flags
bit 3: DOS is in ROM
bit 4: DOS is in HMA
AL = FFh if true DOS version < 5.0
Notes: this function always returns the true version number, unlike AH=30h,
whose return value may be changed with SETVER
because of the conflict from the CBIS redirector (see next
entry), programs should check whether BH is less than 100 (64h)
and BL is at least 5 before accepting the returned BX as the true
version number; however, even this is not entirely reliable when
that redirector is loaded
fully reentrant
the only bug here: FD 21/3306 isn't reentrant
BTW: debug call int21/30 only.
tom
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