HP41C with Rp Pico attached

[blackjetrock]

(07-25-2023 03:18 PM)ThomasF Wrote:  

(07-25-2023 03:13 PM)blackjetrock Wrote:  You could remove the system ROM and replace it all, using the RP2040 flash to store the new ROM. Then you can rewrite the system ROM entirely if you want to...

Andrew

Yes, this was just a crude way to replace a single instruction.
The complete ROM could also be replaced and modified as you say.
This just shows how versatile your idea with the 2040 is!

Cheers,
Thomas

I think it's probably safe to modify a single bit this way, but forcing the ROM output like this all th e time
is probably too much stress.