INT 13 - IBMCACHE.SYS - CACHE STATUS                                            
	AH = 1Dh
	AL = subfunction
	    01h get status record
		DL = drive???
		Return: ES:BX -> status record (see #00263)
			CF set on error
			    AH = error code
	    02h set cache status
		ES:BX -> status record (see #00263)
		DL = drive???
		Return: CF set on error


Format of IBMCACHE.SYS status record:
Offset	Size	Description	(Table 00263)
 00h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	total number of read requests
 04h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	total number of hits
 08h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	number of physical disk reads
 0Ch	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	total number of sectors requested by physical disk reads
 10h  6 BYTEs	???
 16h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	pointer to start of error list (see #00264)
 1Ah	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	pointer to end of error list
 1Eh	WORD	???
 20h	BYTE	using extended memory if nonzero
 21h	BYTE	???
 22h  4 BYTEs	ASCII version number
 26h	WORD	cache size in KB
 28h	WORD	sectors per page


Format of IBMCACHE.SYS error list:
Offset	Size	Description	(Table 00264)
 00h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	relative block address of bad page
 04h	BYTE	drive
 05h	BYTE	sector bit-map
 06h	WORD	next error