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AH = 0Fh CX = number of characters to read ES:BX -> buffer DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return:
AX = number of characters read ZF clear if successful ZF set on error (line status or wrong number of characters)
See Also: AH=0Eh"Digiboard"
Category: Serial I/O - Int 14h - D
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