Category: serial I/O

INT 14 - MultiDOS Plus - SET MONITOR MODE

	AH = 24h
	AL = port status storage
	    00h single status for entire receive buffer
	    01h separate status kept for each byte in receive buffer
	DX = port number
Return: AH = status
	    00h successful
	    3Ah invalid status storage specified
	    41h no such port
	    64h monitor mode already active
Note:	in monitor mode, MultiDOS redirects all BIOS video output to a serial
	  port
SeeAlso: AH=20h"MultiDOS",AH=25h