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Function 30h (48) Get DOS Version Number
Returns the major and minor version numbers of DOS.
On entry: AH 30h
Returns: AL Major version number
AH Minor version number
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Example: If this call were used under DOS 2.11, AL would
return 02h, and AH would return 0Bh (11 decimal).
Notes: DOS 1.x returns 00h in AL.