Are us nerds all aware of the picoRom project? It emulates up to a 32K
ROM using USB with a very easy to use interface. I have been using them
for other projects and while using it this morning, I was thinking how
neat it would be to make an adapter for the socket on the M100, though I
think it could plug directly into the expansion connector.
An adapter for the system ROM might even be helpful for those
experimenting with System ROM replacement.
I know the Rex# (I have one, need to get another!) can handle all of
this but it was just a passing thought and realized some here may still
be interested in knowing about this little miracle.
https://www.tindie.com/products/epromfoundry/picorom-v17-eprom-emulator/
(Not my store. Just a user.)