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I just managed to program some AM29F032, but for some I can't erase them anymore. Since the programer (TOP3000) checks the protection option by default, I was wondering if the protection is permanent and cannot be reversed. There's an unlock option in the menu, it confirms but result is the same...

I got a Puzzle de Pon that was not working reliably, I think it just needed a good cleanup, as after it works every time. However I noticed that if I move and stop in certain positions, part of the MC sprite would disappear, if I shoot without moving it would reappear. I tested on 2 MVS models...

I'm fixing this board and the last hurdle is this glitch. I tried checking all P lines, between chips and to the cart, and all seem good, also tried changing the L0 74LS245 just in case. Anyone would have some idea of what to check ? View: https://youtu.be/BjpeSbNEboU

I have this MV2F slot that I repaired, and if I use the 2nd slot, I lose sound forever, like doing : -1 game on slot2 -2 games, when I select slot2 game, sound is gone, and doesn't come back after selecting back slot1 game. I know unibios4 has a no-sound bug with no game on slot1, but this also...

I was given a CPS2 A board that had a physically blown TD62064 7A, and after replacing it and testing I got a huge buzzing sound. https://streamable.com/09o1cv On a cold boot in the sound menu I get the volume control and up down works (has no effect on buzz volume), but after a few seconds, it...

Greetings, I have been founding lots of info here when doing repairs, and I hope experienced ones will be able to lend a hand on some thing I can't resolve by myself. I've always be a tinkerer and recently I did some MVS/AES repairs thanks to the tools availble, mostly Diagbios.