Int 14/AH=12h

AH = 12h
DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)

Return:
AX = number of bytes free

See Also: AH=0Ah"Digiboard" - AH=14h"Digiboard"

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