Retrochallenge 2017/04: 6502 on Arduino

This is my late entry for the 2017/04 retrochallenge. Notwithstanding my 2015 failure to launch, I plan to work on Arduino based emulators for various 6502 computers.

A few years ago I built an Arduino shield to host a real 6502 using the Arduino as RAM, PIA, and  glue logic. To some extent the software that this project ran was an afterthought, as it turned out the Apple 1 Woz monitor was perfect a proof of concept.

For the recent Arduino Day I brushed off my old code and reworked it to use an emulated CPU core so the sketch can run on an unadorned Arduino Uno or Mega.

For retrochallenge 2017/04 I plan to continue this work.


  • Clean up my sketch and publish the code to GitHub. I plan to target the Arduino Uno and Arduino Mega natively.
  • Hopefully add support for other monitors like Microsoft 8k BASIC.
  • Stretch goal: Rockwell made a 6502 variant called the R65F11 which was a 6502 with FORTH built into on chip ROM. Details are sketchy, but I found this pdf online and maybe if the ROM can be uncovered I can emulate that system.