INT 13 u - QUICKCACHE II v4.20 - GET INFO
        AH = 30h
        AL = what to get
            00h system info (see below)
            01h drive info (see below)
            02h access frequency (array of 30 words)
            03h drive index
                (array of 32 bytes indicating BIOS drive for DOS drive)
        DS:DX -> buffer for info
Return: AX = status (0000h successful, 8000h invalid info specifier)
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
          Associates, Inc.

Format of system info:
Offset  Size    Description
 00h    BYTE    flag: cache enabled
 01h    BYTE    flag: buffered writes enabled
 02h    BYTE    flag: buffered reads enabled
 03h    BYTE    flag: sounds enabled
 04h    BYTE    flag: autodismount enabled
 05h    BYTE    ???
 06h    BYTE    flag: ???
 07h    BYTE    flag: ???
 08h    BYTE    flag: "em_assigned"
 09h    BYTE    flag: emulated EMS
 0Ah    BYTE    single sector bonus
 0Bh    BYTE    "sticky_max"
 0Ch    BYTE    write sector bonus
 0Dh    BYTE    bonus threshold
 0Eh    WORD    flush interval
 10h    WORD    flush count
 12h    WORD    reserve pool size
 14h    WORD    remaining space in reserve pool
 16h    WORD    required free memory
 18h    WORD    total cache sectors
 1Ah    WORD    dirty cache sectors
 1Ch    BYTE    trace buffer size
 1Dh    BYTE    reserved (padding)

Format of drive info [16-element array, one element]:
Offset  Size    Description
 00h    BYTE    DOS drive number
 01h    BYTE    BIOS drive number
 02h    BYTE    maximum sector number
 03h    BYTE    maximum head number
 04h    BYTE    read buffer size
 05h    BYTE    write buffer size
 06h    BYTE    last status
 07h    BYTE    flag: enabled
 08h    BYTE    flag: buffered write enabled
 09h    BYTE    flag: buffered read enabled
 0Ah    BYTE    flag: in use (drive info is valid)
 0Bh    BYTE    flag: cylinder flush
 0Ch    BYTE    reserved (padding)
 0Dh    BYTE    sectors per track
 0Eh    WORD    sector size
 10h    WORD    sectors assigned
 12h    WORD    dirty sectors
 14h    WORD    reserved sectors
 16h    WORD    number of read errors
 18h    WORD    number of write errors
 1Ah    DWORD   "rio_count"
 1Eh    DWORD   number of cache misses
 22h    DWORD   "wio_count"
 26h    DWORD   "dio_count"

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