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

entry   AH      44h 

	AL	04h	Read From Block Device (drive number in BL)

			BL      drive number (0=default) 

			CX      number of bytes to read 

			DS:DX   pointer to buffer 

			return  AX      number of bytes read
file: /Techref/int/21f/44sf/04.htm, 0KB, , updated: 1999/4/26 12:36, local time: 2025/5/24 11:49,
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<A HREF="http://www.piclist.com/techref/int/21f/44sf/04.htm"> int 21f 44sf 04</A>
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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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