As part of my repair series on the Europlus, the next step I'm taking to investigate the "screen full of question marks" is to ensure the ROMs are working, valid chips.

As before, I decided to use my TL866II to dump the ROMs, with suitable mapping of pins between the ROMs, and a similar ROM that t...

I had previously programmed an ATmega328P using AVRDude - this was some time ago, and I was not even sure what program I had applied.

When I attempted to overwrite the program using the Arduino IDE, I hit a dead end. I got the error message:

stk500_recv(): programmer is not responding

It was c...