mega-legacy-pinout

[rusefillc]

@ggurov are you involved/aware of https://github.com/amrikarisma/fw-custom-mega100/tree/mega-legacy-pinout?

[ggurov]

negative, not involved and first time i'm hearing about this. those look like 0.4 speeduino and ua4c baseboard pinouts., a fairly noble effort that someone might be able to benefit from