Int 21 Fn 4404  - Combi-disk V1.13 - Get Data Record                       [c]

   AX = 4404h
   BL = drive number (00h = default, 01h = A:, etc)
   CX =  (length of data packet)
   DS:DX -> buffer for data packet (see below)

Return: CF clear if successful
       AX = number of bytes actually transferred
   CF set on error
       AX = error code (01h,05h,06h,0Dh) (see AH=59h)
Program: COMBI-disk is a shareware combination cache and RAMdisk sharing a
     single pool of memory by Vadim V. Vlasov

Note:  the installation check consists of scanning the valid drives for one
     which returns a correctly-sized data packet with the proper
     signature in the first field

See Also: AX=4405h"COMBI"
Index: installation check;COMBI-disk

Format of data packet:
Offset Size    Description
 00h  6 BYTEs  ASCIZ signature "COMBI"
 06h   WORD    version (high byte = major, low = decimal minor version)
 08h   BYTE    current options (see below)
 09h   BYTE    sectors per allocation block
 0Ah   WORD    maximum buffer in KB
 0Ch   WORD    current buffer in KB (less than max if XMS memory being lent)
 0Eh   WORD    total number of allocation blocks
 10h   WORD    current number of allocation blocks
 12h   WORD    number of blocks being used by RAM disk
 14h   WORD    number of blocks being used by cache or unused
 16h   WORD    number of dirty cache blocks
 18h   WORD    number of blocks which could not be written out due to errors
 1Ah   WORD    total number of read requests
 1Ch   WORD    total number of sectors read
 1Eh   WORD    number of BIOS read requests (cache misses)
 20h   WORD    number of sectors read via BIOS (cache misses)
 22h   WORD    total number of write requests
 24h   WORD    total number of sectors written
 26h   WORD    number of BIOS write requests
 28h   WORD    number of sectors written via BIOS
 2Ah   WORD    number of RAM disk read requests
 2Ch   WORD    number of sectors read from RAM disk
 2Eh   WORD    number of RAM disk write requests
 30h   WORD    number of sectors written to RAM disk