There is a pretty low-level iso image for Raspberry Pi 1/Zero I have. It boots in about six seconds and I used it to create a "Plug and Play" composite TV arcade stick thingy. Was super fun. The dev has passed away but the image still exists...
Viewing post in FPGA Pico-8 implementation ? ;)
Look, I know exactly where my SDCard is. I will first Google and see if I can find a link, otherwise I will find some sort of way to share it. Nice thing is my copy is already setup with 240p and 800mhz OC so ready for a pi 1 or pi Zero...
*Edit* Here is the thread I followed to make my SDCard, it does seem as if the link is currently broken. I will keep looking and see if I can find a copy on Archive.org maybe...?
*Edit the second* Here is the Wayback Machine link, hope it works for you! http://web.archive.org/web/20200114205739/http://guillermoamaral.com/read/picopi/