Source code of Windows XP (NT5)
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major_version equ 5 ;Major DOS versionminor_version equ 00 ;Minor DOS Version for int 21h/30hminor_version_NT equ 50 ;Minor DOS VersionN for int 21h/3306
expected_version equ (MINOR_VERSION SHL 8)+MAJOR_VERSION
DOSREVNM equ 00000000B ; bits 0-2 = revision number of DOS ; currently 0.DOSINROM equ 00001000B ; bit 3 of ver flags returned in BHDOSINHMA equ 00010000B ; bit 4 of ver flags
; if1; %OUT ... for DOS Version 5.00 ...; endif
;****************************** ;Each assembler program should: ; mov ah,030h ;DOS Get Version function ; int 021h ;Version ret. in AX,minor version first ; cmp ax,expected_version ;ALL utilities should check for an ; jne error_handler ; EXACT version match. ;******************************
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