Int 21/AX=2B01h/CX=444Dh

Quarterdeck DOS-UP.SYS v2.00 - INSTALLATION CHECK

AX = 2B01h
CX = 444Dh ('DM')
DX = 4158h ('AX')

Return:
AX = 0000h if installed
BX = DOS-UP version (BH = minor, BL = major)
CX = 4845h ('HE')
DX = 5245h ('RE')
ES = DOS-UP driver segment

Category: Memory Management - Int 21h - Q

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