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AX = 4321h EAX = 87654321h (entire EAX value required)
Return:
EAX = 12345678h if Q87 is installed
Note: This call requires that VCPI services be available; if they are not, this call will not be recognized
BUG: V4.00-v4.03 will hang on most machines when run under bare DOS with no memory manager, because neither Q87 nor UNLOAD87 checks whether there is a valid INT 67 handler before performing an installation check via INT 67
See Also: AX=2833h - INT 21/AX=4321h
Category: Emulators - Int 67h - Q
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