This is a PCB to assemble your own keyboard adapter to use one of the following keyboards:
with either Apple 1 / Replica 1 plus, Apple II, or Serial TTL (I.e. RC2014) system.
See the full project notes on the authors website: https://p-l4b.github.io/appledore/
I have contributed the C16 firmware to the authors site, and the RC2014 (TM) compatible firmware is on my github here:
https://github.com/Alex-Kw/c64-rc2014-Keyboard
NOT included are any parts with this listing. You will need to assemble it and select the correct firmware for your Arduino Nano.