Click above to get retro games delivered to your door ever month!

        Cache status

        Entry:
          AH = 1Dh
          AL = subfunction
              01h get status record
                  DL = drive???
                  Return: ES:BX -> status record
                          CF set on error
                              AH = error code
              02h set cache status
                  ES:BX -> status record
                  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 K
         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