David BoucherI've improved (well, simplified) the ESP8266 version a little bit:
The IO expander chip is not needed, so this is just an ESP826 dev board (Wemos D1 mini in this case) along with the screen, buttons, and speaker as before. Functionally, it's identical to the original as I've not used the WiFi or extra storage of the ESP8266. It's a little faster than the Teensy but not by much.
The source code can be downloaded from https://dboucher.org.uk/edsac/.
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