ZERO_MILES
Enthusiast
Hello again!
I have a genuine Karate Blazers PCB that is showing a strange behavior: all backgrounds in-game are shifted about 30% up, so I see a solid color from the bottom and then the backgrounds are drawn above that.
Everything else looks absolutely perfect, no graphics corruption, not even the backgrounds are corrupted per se, they're just shifted up, as if the game was drawing them in the wrong place.
Keeping in mind I don't have an oscilloscope, what are the most obvious causes for a problem like this? Should I dump all eproms/mask roms and check them with ROMIdent? Or is this kind of problem usually caused by something else?
I've seen bad RAM cause gfx glitches and corruption, but never something that fits this description (perfect looking BGs, but shifted up).
Cheers!
I have a genuine Karate Blazers PCB that is showing a strange behavior: all backgrounds in-game are shifted about 30% up, so I see a solid color from the bottom and then the backgrounds are drawn above that.
Everything else looks absolutely perfect, no graphics corruption, not even the backgrounds are corrupted per se, they're just shifted up, as if the game was drawing them in the wrong place.
Keeping in mind I don't have an oscilloscope, what are the most obvious causes for a problem like this? Should I dump all eproms/mask roms and check them with ROMIdent? Or is this kind of problem usually caused by something else?
I've seen bad RAM cause gfx glitches and corruption, but never something that fits this description (perfect looking BGs, but shifted up).
Cheers!
