Having recently aquired a fairly cheap King Of Fighters '96 MVS cart, I've decided to finally follow my dream to build a supergun in lieu of my eventual purchase of a MV-1 or MV-1F board (anyone selling one cheap?). For now, I'd like to have the supergun output composite AV to work on my TV (although I plan on making the connection from the harness modular so I could easily add in RGB support once I get the money/space for a dedicated monitor.) Now, I have no intention of spending ~$70 on a JROK encoder, and thankfully Antipasta came to the rescue with the suggestion that the Sony CXA1645 chip from a Playstation, Saturn (even Genesis?) could be shanghaied for that purpose. Has anyone here done this, or could provide a link to any sort of walkthrough/schematic for the circuit I'd need to make?
Also, I've got a fairly non-working NES that I plan on using for the shell of the supergun, which brings the question: it would be ghetto and lo-fi as all hell, but is there any way I could tap into the NES' AV outputs for this project and just use the encoder there?