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There is a driver and firmware for sigrok for using the PI Pico that was posted to Hackaday a while back. It hasn't been merged upstream yet but I got it up and running today just fine building it from source. https://github.com/pico-coder/sigrok-pico
The mentioned N64 cartridge is most likely this project:
https://github.com/kbeckmann/PicoCart64/
The creator [0] tweets about it frequently, in particular this thread [1]. It uses the cool RP2040 Stamp [2] mini-board with FlexyPins [3], a very interesting way of putting putting boards with castellated edges (that's the patterned edge with contacts built right into it) onto a carrier board.
[0] https://twitter.com/kbeckmann/
[1] https://twitter.com/kbeckmann/status/1538634588020424708
[2] https://lectronz.com/products/rp2040-stamp
[3] https://lectronz.com/products/flexypin-pack-of-100
Nice! Looks like the protocol between the Pico and the Windows software is quite simple. Porting it to another OS shouldn't too hard.
Here's an unusual approach to portability for this kind of software: since Chrome supports Web Serial, a web app could do the UI and then it would be portable across operating systems (though still Chromium specific) with no software to install (assuming you already have Chrome or Edge).
Along those lines, I wrote a little web app that plots CSV data from a microcontroller board (which happens to be a Pico). There's not a lot to it, but I like it better than the Arduino plotter and it might be useful as an example:
https://github.com/skybrian/serialviz
Have you seen gbs-control?[1] It's not exactly what you're trying to do, but maybe close enough?
[1] https://github.com/ramapcsx2/gbs-control
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