Q45170: Using CALL INTERRUPT to Return DOS Version Number

Article: Q45170
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | B_BasicCom | mspl13_basic
Last Modified: 13-DEC-1989

The program shown below demonstrates how to use CALL INTERRUPT to
return the DOS version number.

This information applies to Microsoft QuickBASIC Versions 4.00, 4.00b,
and 4.50 and to the Microsoft BASIC Compiler Versions 6.00, and 6.00b
for MS-DOS, and to Microsoft BASIC PDS Version 7.00 for MS-DOS.

The following program is INTVER.BAS:

' $INCLUDE: 'qb.bi'
' For BC.EXE and QBX.EXE in BASIC 7.00 the include is 'QBX.BI'

DIM inregs AS RegType, outregs AS RegType
inregs.ax = &H3000
CALL INTERRUPT(&H21, inregs, outregs)
majorver = outregs.ax AND &HFF
minorver = (outregs.ax AND &HFF00) / 256
PRINT "MS-DOS Version: "; majorver; "."; minorver

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