I'm surprised you can find memory at all for those old computers. Even if you put more memory in it, it still isn't going to be very practical to use for stuff like web surfing, etc. Anytime you run a GUI, that requires a lot of resources. I put 6.2 on a 486 with 42M of RAM and it was extremely slow. 7.2 will be practically unusable. 486's really are just too old to support any OS with a GUI, except for maybe 95 and NT 4, but you would still need more memory. If you want to familiarize yourself with linux, you need some decent hardware, something in the PII ~350Mhz range with 128M of RAM. You can always also dual-boot your main computer. If you want to use the 486 for other things like a router/firewall or a file server, I can make some suggestions if you're interested.