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hello, I'm working on a gaelco world rally that has some grafic issues with words and objects. If someone has worked already on this pcb please can give me some hints to find the ic or the area of the pcb that is possibly broken. Since some rams have been replaced and I see on the other working...

Hello, I'm repairing this golden axe bootleg. Initially characters sprites were missing so after reflashilng almost all roms(no stickers) I replaced the broken74hc138, the ls298 which was broken and the resistor missing and now the characters are missing but removing the ls189 they reappear...

Hello, searching for those. Please shout out if you hear something about. Thanks

hello, I'm repairing this bootleg wonder boy 3 which has a sync issue (image is slowly rolling vertically and also slightly shifted to the right with a portion that returns to the left) and missing audio. For those who are going to suggest to trim the monitor I already did and that's the best...

Hello, I'm searching for it. Even to be tested. Thanks makedome

hello, I'm searching for one of those pcbs, even not working: Rad Mobile, F1 Exhaust Note,Rad Rally,Spider-Man: The Video Game, Air Rescue,Arabian Fight,Dark Edge,F1 Super Lap, Outrunners, stadium cross, Title Fight Hard Dunk Thanks

Hello, I'm trying to repair an Outrunners pcb that has no sound: The test reports ic21 bad: it's the mb8464, the ram next to z80. I tried to replace it with another one but no change. The other things I checked so far: - the amplifier works fine, - the z80 address and data lines are toggling...

Good morning, do you know where can I find information about jamma pcbs architecture blocks? I'm searching something dealing not about single components like cpus, rams, roms ,,,,but something describing the different blocks that make those boards work. Thanks makedome

Hello, I'm trying to program those eproms with this programmer version 5.0e but I'm receiving error after writing phase during verification. I checked the voltage on pin 1-16 and I have 12 for 2764 and 21 for 2532. What am I doing wrong? Thanks makedome

Hello, I'm trying to repair a Shadow Force jamma pcb and schematics would help me a lot. Also other Technos boards could be usefull. Do you have a link where I could find those? Any hint would be appreciated. Thanks

Hello, I'm working at this drive out bootleg jamma pcb that has a corrupted image on some screens and it's totally messed up of black on others. I have another one working so I swapped the eprom am27c040 (number 8) which is causing the issue and also the 2 mc74hc273 on the left with it and the...

Hello, I'm looking into this jamma board. Once upon a time it was starting but with no figures sprites but now it's giving error on ic33. A strange error actually: IC33 fail 5CXXX IC33 PASS XXXXX IC26 PASS XXXX IC14 PASS XXXXX Since the game EPROM are 4: IC33,IC34,IC26 AND IC14 I'm suspecting...