I have a big interesst in homebrewing.
In case you don’t know what homebrew means.
It’s when you develop for a system as a hobbyist and not as a big company.
Otherwise here check out Wikipedia for it :)

In the past I’ve developed for the PSP Sega Dreamcast, Sega Saturn, Game Boy Advance and MS-DOS.

In case you are interested, both demos are open source and can be found on my GitHub
and I wrote a little page how I developed for my dreamcast :)

Nothing serious yet, but a lot of fun and getting knowledge about computer science and system architecture.