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Well, this is what I've done finally. I erased the second qsound rom from SFZ (sfz.02) and tried to reprogram it, just to see if the problem was that the first eprom was faulty and if that's the reason I can't reprogram it... but no luck there, so the problem seems to be that I have not been...

Hello again! Many thanks for your answers. I'll try to clarify some things: The roms were original, no phoenix or anything: the board comes from an arcade long time ago. About 15 years. The surprise is that is not suicided yet, but maybe the battery was changed sometime. Those SONY...

Sorry about that Mitsurugi-w, I added my location now. Skate323k137 maybe I minunderstood. I don't want to buy a new equivalent chip, what I was trying to do (if possible) is to reprogram the actual Sony chip, just can't select that on the program I use and while I can read it, I can't write to...

Thanks for the fast reply! I tried the one you suggested (FUJITSU MBM27c1001) but same results as before. I can read, but not write. I remember having to try some differents options when I reprogrammed a dead board long time ago, because as you said, the eproms on the same game were mixed ones...

Hello there! This is my first post, I registered to ask help repairing a CPS2 board. I have an hispanic Street Fighter Zero CPS2 board which, when I tested it, gives sound problems. The sound problems were very strange: the intro has all the sound effects but no music, and in game there were...