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AH = 82h DX = port number
Return:
AH bit 7 set on error AH bit 7 clear if successful
Desc: Reset the port to its state before the AH=81h initialization and unhook any interrupts used by the port
See Also: AH=81h"COMM-DRV" - AH=83h"COMM-DRV"
Category: Serial I/O - Int 14h - C
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