)
Call Access Server driver "get input from port" function with:
	AH = 03h
	AL = port number (00h-0Fh)
	CX = size of data buffer
	ES:BX -> buffer for data
	interrupts disabled
Return: CF clear if successful
	CF set on error
	interrupts disabled
	CX = number of bytes read
Note:	the driver will add a NUL to the buffer when a break signal is detected
SeeAlso: #02912,#02913