Well, I managed to build something over the weekend.

https://retropie.org.uk/forum/topic/21596/retropie-in-a-psone-case-1-0-march-2019

I'll update that thread as I go along.

@chris-red Nice work!!

Update

I bought another of the same psx to usb. the one I linked to above. Works flawless when i plug the psone controller into the psx to usb device. I then soldered wire on top of the existing connection and wired it to the original controller port. Plugging the controller into the original port i get the same issue mentioned above, but i can unplug it and plug it in to the adapter and it works fine. I have also noted i get quite a bit of brownouts when i plug it in to original port. Could it be the power supply is not powerful enough?

@lostless yup. Thats why these games are better on a crt. Developers knew the quirks and capabilities and used them to cheat the system.

@katemonster Hey katemonster, I hope you see this. I'm doing something a lot like this. But I want to use the RGB instead. I found two diagrams that are pretty different from each other for how to get RGB from VGA to the input of the LCD. Do you have information on this?

One diagram uses 270 resistance to intersect the combination of VGA pins 14 and 13 with the green, but only uses one VGA ground pin. The other diagram includes no resistance, uses 3 ground pins from vga. Neither worked, and I've been trying for a week. Its possible they didn't work because of my breadboard, or contact from a wire MAY have been bad when I tested. But I haven't been able to find information that anyone has verified to work. You definitely seem knowledgeable.

Nice, I'm trying to make one on the basis of a pi zero with integrated screen, I only have the speakers to install.
my project