Int 21/AX=4321h/BX=0000h

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Q87, Q387 - INSTALLATION CHECK

AX = 4321h
BX = 0000h
EAX = 87654321h (entire EAX value is required, not just AX)

Return:
EAX = 12345678h if installed

Program: Q387 (renamed to Q87 as of v3.7) is a math coprocessor emulator from Quickware

Note: This function is available only in virtual-86 mode in older versions; newer versions also provide it in MS Windows 16- and 32-bit protected mode

See Also: AX=4321h/BX=0001h - AX=4321h/BX=0002h - INT 67/AX=4321h

Category: Emulators - Int 21h - Q

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