Category: <b>disk I/O enhancements</b>
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<pre><b>INT 13 - XDF.COM - API</b>

	AH = 18h
	CX = D2C9h ("R"+80h, "I"+80h = Roger Ivey)
	DX = 0000h
	BX = function
	    0000h installation check
		  Return: AH = 0Ch
			  CX = 7269h ("ri" = Roger Ivey)
			  ES = segment of driver
			  CF set
	    2F64h ("/d") disable the driver
		  Return: AH = 0Ch
			  ES:BX = pointer to activation flag (it is set to 0:
				  set it to 1 to enable the driver again)
			  CX = 7269h
			  CF set
	    2F75h ("/u") unload the driver (restore interrupts &amp free memory)
		  Return: AH = 0Ch
			  DL = 55h ("U") if successful
			     = 00h	   if fails
			  CX = 7269h
			  ES = segment of driver
			  CF set
			  AL, BX, DH, and DI destroyed
Program: XDF is a TSR provided with PC-DOS 7.0 to support XDF 1.84M disks,
	  developed by Roger D. Ivey
Note:	After disabling or enabling the driver, a disk change must be performed
	  or simulated to reset the driver.
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