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AH = 30h
EAX = 00003000h
EBX = 50484152h ("PHAR")
Return:
AL = major DOS version
AH = minor DOS version
EAX bits 31-16 = 4458h ('DX') if 386/DOS-extender installed
BL = ASCII major version number
EAX bits 31-16 = 4243h ('BC') if Intel Code Builder installed
EDX = address of GDA
See Also: AX=2501h - AX=FF00h - INT 2F/AX=F100h
Category: DOS Extenders - Int 21h - P
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