Function  04h   Auxiliary Output 
      Write character to STDAUX device\driver\AUX-
entry   AH      04h 
	DL      char to send to AUX 
return  none 
note 1) This function call does not return status or error codes. For greater  
	control it is recommended that you use ROM BIOS routine Int\14 or
	write to device\driver\AUX- and use device\IOCTLs.
     2) If Ctrl-C is has been entered from STDIN, Int\23 is executed.
     3) Default is device\driver\COM1- unless redirected by DOS.
     4) If the device is busy, this function will wait until it is ready.