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

Format of status record:
Offset  Size    Description
 00h    DWORD   total number of read requests
 04h    DWORD   total number of hits
 08h    DWORD   number of physical disk reads
 0Ch    DWORD   total number of sectors requested by physical disk reads
 10h  6 bytes   ???
 16h    DWORD   pointer to start of error list
 1Ah    DWORD   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 error list:
Offset  Size    Description
 00h    DWORD   relative block address of bad page
 04h    BYTE    drive
 05h    BYTE    sector bit-map
 06h    WORD    next error

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