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Function  44h   I/O Control for Devices (IOCTL)  Get or Set Device Information

entry   AH      44h 

	AL	06h	Get Input Handle Status

			BX      file or device handle 

			return  AL      0FFh    device ready 

			                00h     device not ready
file: /Techref/int/21f/44sf/06.htm, 0KB, , updated: 1999/4/26 11:36, local time: 2024/12/4 16:32,
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Quick, Easy and CHEAP! RCL-1 RS232 Level Converter in a DB9 backshell
Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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