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

entry   AH      44h 

	AL	03h	Write Device Control String

			BX      device handle 

			CX      number of bytes to write 

			DS:DX   pointer to buffer 

			return  AX      number of bytes written
file: /Techref/int/21f/44sf/03.htm, 0KB, , updated: 1999/4/26 12:36, local time: 2025/5/24 13:33,
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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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