TURTLE?!
as in LOGO?!?!
if you're asking about LOGO, you my friend, kick some serious ass.
i would say grab the C64 or Apple ][ emulator and download the disk image of logo. the keyboard might be an issue, im not sure. i havent tried my C64 emu with a keyboard yet. im sure you could run a linux emu. for those old computers tho, and run LOGO that way.
if LOGO is what you are in fact talking about.
</over zealousness>
edit:
http://74.125.95.132/search?q=cache:aaLazh...us&ie=UTF-8has a link to logo for linux. not sure if it works or not.