Why so secretive? I really don't get it. It's firmware for a 30 year old game console, not the nuclear codes.
I'm one of the people with a Sophia running an earlier dev firmware (socketed IC, no copy protection):
Some time back I thought it’d be fun to try multiplayer via Taisen Cable on the Sophia. At the time I think I had five Sophias including a Graphics Box but took a photo of 3x Programming Boxes and the Graphics Box (of this batch I currently only own the Graphics Box, the PBs all now with new...
www.prototopia.net
I'm more than happy to dump it and share it publicly, along with firmware dumps from the other 8 saturns of various regions/models I have, in case there's anything new in there too. I have all the tools/skills to put something together to do the dumping on my end, but I don't have the time or inclination to figure out the method from scratch and design something new to do it, yet again, a decade after it was first done. Surely in 2025, we can have some gerbers and source up on github with a DIY dumping guide? That's what I'm waiting for.