If you scroll down below the ordering section, you'll see an EPROM containing:
"The Diskless Elf/OS ROM by Mike Riley gives you a taste of everything! It has Tiny BASIC, FORTH, Lisp, VTL2, a monitor, simulator, and a mini-editor/assembler. It can also upload/download files in XMODEM format to use your PC as its "disk". All in a single 32k ROM!"
That EPROM can be ordered for $5.
There's a link to Riley's site. The Lisp interpreter I found there is a 2600 line file of fully commented asm.
Edit: this is, after all, a 64K computer kit, usually 32K RAM 32K ROM, but it could be 64K RAM, if you toggle in a minimum bootloader each time, like they did in the old days.
You can do a lot with 64K.
For comparison, the original Arduino Uno had only 2K RAM and was announced about six months after this kit came out.
