INT 7F - Alloy MW386 - CHANGE CONSOLE MODE                                      
	AH = C5h
	AL = new console mode
	    00h keyboard indirect
	    01h keyboard direct
	    02h data handshake enforced
	    03h no data handshake
Return: CF clear if successful
	    AL = prior console mode
	CF set on error (caller is not remote user)
Note:	modes 2 and 3 may be used for input through the console port; no video
	  output should be performed in these modes