I ported the CHESSmate code to a Raspberry Pi 4 running under a Python based 6502 emulator. One thing that I learned doing this is that this emulator runs way to slow to be a viable option. Perhaps a C based 6502 emulator running on the Pi would fare better.
![](https://cdn.hackaday.io/images/7978721707414257171.jpg)
To my surprise, CHESSmate exhibited exactly the same errant behavior as it did running on the ESP32 and the Arduino Pro Mini. So there is no way that these glitches are a result of a misbehaving emulator.
So I guess I'm back to bad ROM images. I guess I'll have to dump the original CHESSmate ROM to know for sure.
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