Not sure, all modern Lisp implementations require more RAM than I had available.

The closest I've found was things like Lisp implementations for 8-bit microcomputers of the 80s, eg. http://www.worldofspectrum.org/infoseekid.cgi?id=0008718 (Lisp in a ZX Spectrum 48K).

According to Wikipedia, the first LISP was implemented on an IBM 704, however that compares to your small system.