User's Guide Desktop PC Apex 200\20, Apex 200\40

If you need to change anything in the AUTOEXEC.BAT file
later, you can use the same procedure to modify the commands.
See your MS-DOS Reference Manual for instructions.
Using HDCACHE for the Hard Disk
You can use the MS-DOS program HDCACHE to enhance the
performance of your hard disk. This program makes the hard
disk work more efficiently by storing data requests in a reserved
part of memory. See your MS-DOS Reference Manual for more
information.