Gotta pass this along, I've only read the page and watched the video, but it's certainly novel.

http://blog.nullspace.io/apple-2-lisp-part-1.html

It seems that most of the Lisp environment is written in C (a la cc65), so I wonder what sort of overhead they're running with. Lisp can get pretty big on 8-bit systems, given that all the symbolic names in the source code remain in the runtime as independent objects, and the default composite data structure is singly-linked list nodes.

I'm looking forward to page 2 when they get into the nitty gritty.

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WFDis Interactive 6502 Disassembler
AcheronVM: A Reconfigurable 16-bit Virtual CPU for the 6502 Microprocessor

Yea, me too. Funny, the I was only looking at the ASM code and it seemed incomplete, I thought the C code was there to handle the audio encoding of the data. Doh!

What little I saw, it seems each piece of data was at least 3 bytes.

Obviously this IS a Lisp, but an extremely limited one. Looks like they alloc a 16K heap plus 1500+ for a fixed symbol table, so that's little more than 5K "words" of working memory.

But it was novel, I thought the transfer via the cassette interface particularly interesting. The lamenting of limitations was fun to read as well.