Int 14/AH=81h

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COURIERS.COM - CHECK IF PORT BUSY

AH = 81h
AL = port number (1-4)

Return:
AH = status 00h port available 01h port exists but already in use 02h port nonexistent

Program: COURIERS is a TSR utility by PC Magazine

See Also: AH=83h - AH=8Dh

Category: Serial I/O - Int 14h - C

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