I found this a while ago. It's an archive of source files for a Rockwell Forth chip that some may we familiar with. I will add other documentation as well here.

Cheers!
Andy

Here is the RSC Forth User Manual.

Here are some informational pdfs.

Cheers!

Interesting to see the source code preserved. Rockwell went on to add extra hardware to their 6502 cores to support forth directly. This consisted of a 16-bit register called I, and 10 new instructions to support a direct threaded interpreter. It would be interesting to see the source code of the newer forth interpreter that took advantage of these instructions, although I'd think that the implementation would be quite simple as most of it is implemented in the new instructions. Pretty much all of the Rockwell and Conexant modems used these updates 6502 cores.

Thank you for uploading that, Andy. The Forth tutorial is very well written.

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Got a kilobyte lying fallow in your 65xx's memory map? Sprinkle some VTL02C on it and see how it grows on you!

Mike B. (about me) (learning how to github)

Welcome, Mike.

I've found that whoever wrote Rockwell's documentation did an exceptional job IMO.

To extend this thread a bit, the Rockwell R65C19 device incorporated several complex peripherals onto the chip, support threaded code, and support for digital signal processing. BigEd has a short review of the instruction set here.

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Michael A.

Wow! Thanks so much everyone!