INT E0 - REAL/32 - "C_RAWIO" - PERFORM RAW I/O WITH DEFAULT CONSOLE

	CL = 06h
	DL = mode describing the operation to be performed
	    FFh get console input/status
	    FEh get console status
	    FDh get console input (blocking)
	    else output DL to the console as a character
Return: AX = returned value
	    for DL = FFh, the character or 00h if none available
	    for DL = FEh, 00h if no characters available, FFh if any available
	    for DL = FDh, the character read from the console
	    else AX = 0000h
	may destroy SI,DI???
Notes:	during raw I/O, the special characters ^C, ^O, ^P, and ^S are not
	  interpreted, but are passed through
	if the virtual console is in ^S mode and the owning process calls
	  this function, the ^S state is cleared
SeeAlso: INT E0/CL=01h,INT E0/CL=02h,INT 21/AH=06h