Rockwell made many 6502 variants. Some were ‘SOCs’, complete computers in an IC.
and Rockwell was strong in Forth, e.g. RSC-Forth products

The Databooks (e.g. 1984 and 1987 Data products) contain many examples of these lines.

In my collection I have two:

• R6501Q one IC R6501AQ and one R6501Q in the Glitchworks R6501Q kit
• R65F11 one IC, a ‘Forth’ computer

Here you find information on:

• R6501Q kit
• R65F11 Forth computer
• RSC-Forth