Raggie, check distrowatch.com. They have lots of useful information.
If older versions of damnsmalllinux are available you might try them. Some old computers work well with syslinux and others with isolinux. With only 64 MB you might not be able to run xwindows for a GUI with some distros.
I think damnsmalllinux, austrumi, or puppy may be your best bets. I think you can tell puppy not to load into RAM.
Good luck and let us know how it turns out.