I'd try something like Damn small linux or other fairly small distro. Any current distro (like say fedora core or suse) will run slowly on such hardware. Redhat 7-8 might be another possibility but it would be hard upgrading software for them. I'd personally recommend sticking with dsl (damn small linux)
it can be found here
http://www.damnsmalllinux.org/
__________________
Gentoo Developer, and 64bit os user
"In feeding Mother Nature, you are fed in return" - Tsunam (2005). Concerning water conservation, and raising water tables.