Interrupt 17h  Printer
(0:005Ch)       access the parallel printer(s) 
		AH is changed. All other registers left alone. 
 
Function  00h   Print Character/send AL to printer DX (0, 1, or 2)  
entry   AH      00h 
	AL      character 
	DX      printer to be used (0,1,2) 
return  AH      status byte 
		bit 
		0       time out 
		1       unused 
		2       unused 
		3       I/O error 
		4       selected 
		5       out of paper 
		6       acknowledge 
		7       not busy 
 
 
Function 01h    Initialize Printer - set init line low, send 0Ch to printer DX  
entry   AH      01h 
	DX      printer port to be initialized (0,1,2) 
return  status as below 
 
 
Function  02h   Printer Status - read status of printer DX into AH  
entry   AH      02h 
	DX      printer port to be used (0,1,2) 
return  AH      bit flags       bit 7   0 = printer is busy 
			        bit 6   ACKnowledge line state 
			        bit 5   out-of-paper line state 
			        bit 4   printer selected line state  
			        bit 3   I/O error 
			        bit 2   unused  
			        bit 1   unused  
			        bit 0   time-out error  
 


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