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DCACHE.DOC
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1991-04-30
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DCACHE Douglas Boling
Purpose: A memory-resident hard disk cache that speeds disk Input/Output by
holding recently-accessed data in RAM, where it can be more quickly
retrieved than by being read again from the hard disk.
Format: DCACHE [/OFF | /ON] [/U] [/Mx] [/E] [/Hx]
Remarks: When entered without any of its optional parameters, DCACHE installs
and activates itself as a 64KB conventional (DOS) memory cache for
the primary hard disk drive in the system. The size of the cache, in
kilobytes, can be varied by inclusion of the /Mx parameter, where x
may be any one of the following values: 16, 32, 64, 128, 256, 512,
1024, 2048, 4096, or 8192. Expanded memory that conforms to the
Lotus/Intel/Microsoft Expanded Memory specification can be used in
place of regular DOS memory by loading DCACHE with the optional /E
parameter.
The /Hx parameter specifies which of two physical hard disks are to
be cached: /H0 is the default primary drive and /H1 is the secondary
drive. Note that a hard disk that is logically partitioned into
several smaller drives is considered as a single drive by DCACHE.
DCACHE cannot be set to cache floppy disk drives, but this need can
be met by entering the BUFFERS=3 command as a line in the system's
CONFIG.SYS.
After DCACHE has been installed, caching may be disabled or
re-enabled by issuing the DCACHE /OFF or DCACHE /ON commands. DCACHE
/U uninstalls the program from memory if no subsequent
terminate-stay-resident program has been loaded and if BIOS interrupt
13h has not been changed since DCACHE was installed.
DCACHE may be executed either from the DOS prompt or as a line in an
AUTOEXEC.BAT file. The DCACHE syntax may be reviewed by entering
DCACHE ? before or after loading the program. In the latter case,
only the /OFF, /ON, and /U options will be displayed. In addition to
the memory reserved for the
cache itself, DCACHE occupies approximately 1,200 bytes of RAM.