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AH = 86h BL = maximum clock ticks to wait before signalling error on input func BH = maximum clock ticks to wait before signalling error on output DX = port number SI = input timeout in clock ticks if BL=FFh and BH=FFh DI = output timeout in clock ticks if BL=FFh and BH=FFh
Return:
AH bit 7 set on error AH bit 7 clear if successful
Note: Functions 02h, 85h, and 8Eh will wait for the input timeout before returning an error when no data is available; functions 01h and 84h will wait for the output timeout before returning an error if there is no space to output the data
See Also:
AH=01h - AH=02h - AH=84h"COMM-DRV" - AH=85h"COM
Category:
Serial I/O
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Int 14h
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C
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