ESP32Superexpander.2ndattempt  - Previous hardware definition (KiCad) files
ESP32forth-7-Superexpander-0.1 - Arduino sketch containing a Superexpander ESPforth version
ESP32superexpander       -  The current Kicad files
Superexpander            - Arduino library for Suoerexpander
SuperExpander.odt        - A description of the project
superexpanderSupport.c   - Code to add to ESP32forth 

A document explaining the Forth code:

https://docs.google.com/document/d/1MlfXAm6yeVxjHgzF-E0LGG0kIZ7gFkiAXZAdYF-DrEk/edit?usp=sharing