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Function 30h Get DOS Version Number

Return DOS version and/or user number

entry AH 30h

return AH minor version number (i.e., DOS 2.10 returns AX = 0A02h)

AL major version number

BH OEM ID number

00h IBM

16h DEC (others not known)

BL:CX 24-bit user serial number

note 1) If AL returns a major version number of zero, the DOS version is

below 1.28 for MSDOS and below 2.00 for PCDOS.

2) IBM PC-DOS always returns 0000h in BX and CX.

3) OS/2 v1.0 Compatibility Box returns a value of 10 for major version.

4) Due to the OS/2 return and the fact that some European versions of DOS

carry higher version numbers than IBM's DOS, utilities which check

for a DOS version should not abort if a higher version than required

is found unless some specific problems are known.

file: /Techref/INT/21f/30.htm, 0KB, , updated: 1999/2/20 10:26, local time: 2024/2/22 23:09,

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