INT 7F - Alloy MW386 - READ CONSOLE DATA BYTE                                   
	AH = C7h
Return: CF clear if successful
	    AL = byte read
	CF set on error (no data available or caller is not remote user)
Note:	used to read data after placing console in mode 2 or 3 (see AH=C5h)
SeeAlso: AH=C5h,AH=C6h,AH=C8h