I developed my own OS for 80486 machines and ported it PicoCalc … give it a look …
(Note: corrected some critical bugs - now functional)
I tried
export PICO_SDK_PATH=~/my/local/sdk/path
make picocalc
the commit hash of the pico sdk is
a1438dff1d38bd9c65dbd693f0e5db4b9ae91779
then I flashed the uf2 into my picocalc , rp2040
The keyboard lighted up, but nothing showed up on screen
I also tried to insert sd card after power on, still the same
After a new git pull
now it works
I can see a terminal
excellent!
I had to correct some bugs. I also included a Pico 2 version.
The first thing you’ll have to do is issue a mount command - will setup the SD card (so, recommend using a card just for this OS), and would be a one-time deal per SD card.
And my apologies to anyone inconvenienced by my initial posting of this system. It’s still a work-in-progress, but is functional and can do some fun/interesting things with it. The system is fully open source and y’all are certainly free to fork it.