Epson 486SX - Manual (Page 69)

Copying the Reference and Utility Files
If you have a hard disk, you’ll probably want to copy some of
the files on your Reference and Utility diskettes to the hard disk
for convenience. This allows you to run the programs any time
without having to insert a diskette. Copy the following files
from the Reference diskette to your hard disk:
AFDD.EXE ESPEED.EXE HDSIT.COM
HDSIT.VER ROMBIOS.COM
(See Chapter 4 and Appendix B for instructions on using these
files.)
The Reference diskette also contains files for the Setup program
and the System diagnostics program. Because you should
always run these programs from the Reference diskette, do not
copy these files to your hard disk.
The Utility diskettes contain VGA drivers that allow you to
display graphics in certain high-resolution modes. If you want
to use any of these extended modes on your VGA monitor,
copy any VGA files you need to your hard disk. See the VGA
Utilities booklet for instructions.
Note
Be sure to make backup copies of your Reference and Utility
diskettes.
3-2 Using Your Computer