This is just a basic list of some of the things that you should have in your
CONFIG.SYS, you may require more depending on your system.
If you want to use expanded memory emulation and have extended memory and high
memory available then you will probably need to load HIMEM.SYS and EMM386.EXE. For a fuller
description see How do I set up expanded and extended memory?
With the above two files loaded you can add the line "DOS = HIGH" to save conventional
memory.
If you have a CD-ROM or DVD-ROM then you should load the driver here, see
How do I access the CD-ROM? for details of doing
this.
If you aren't in the US then you'll need a country statement as described in
Why do dates and times apear in the wrong format?
If you wish to change the colours or number of lines on the screen,
then you should load ANSI.SYS, refer to ANSI.SYS in the
DOS Reference
section to see how this is done.