Finally, I have found a challenge worthy of mah here bwoi!
Ta-da!
🎊 Old Computer Challenge🎉
gemini://perso.pw/blog/articles/old-computer-challenge-v3.gmi
https://occ.deadnet.se/
And guess what? I don't even have to limit it much to fit the requirements — it's so naturally slow!
The only thing I'm not sure about is lowest possible frequency — at 600Mhz even Amfora would probably be unusable 🤣