Originally Posted by
nihil
DSL will work, although you will probably have difficulty with a lot of today's applications like browsers and office suites. It will run on a DX486 with 16Mb of RAM. Puppy Linux is another distro that will run on 486 platforms so might be worth a try?
Take the RAM out of some of the others? ;) assuming there are spare memory slots.
I would also be inclined to run a utility like DBAN to overwrite the whole drive with zeros before installing the OS.
Good luck!
EDIT:
Another approach would be to get an adapter for laptop PATA drives, slave them to a more powerful desktop and do the installation there.