As a lot of my fx50xp and fx60xp calculators don't work at all or have problems, how about making a new PCB to replace the insides? ... https://www.youtube.com/watch?v=5w6tmykqrYM
I take apart each of these calculators and have a look at the differences. I then turn each calculator into the other, to see what happens
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https://www.youtube.com/watch?v=66Rbsn7mVVk
A first step using an IMSC011 attached to an Arduino Mega which monitors traffic coming from the Pico over a single transputer channel (outgoing).
The Pico is also running an emulator, but it's not wired up to anything.
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https://www.youtube.com/watch?v=0Q0dKOqvNwo
My comms link ROM was an old one, so I have a go at swapping it for one with a more up to date image: V4.2
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https://www.youtube.com/watch?v=44l5Xbu-VNg