I'm trying to debug a PCB for my friend and I suspect that there is a corrupted eprom chip, but this type of eprom is not familiar for me, neither I could not find the type from eprommer (TL866) device list. Chip has these markings in top of it:
ZR040P-2
SINGAPORE
That's all, nothing else. Any ideas if this chip is similar to any other type?
Couple of googlings revealed about nothing for this eprom, not many locations for getting one either.
At the moment game plays correctly (also sounds) until certain stage comes up, the opening screen (see link below) shows completely, but no enemies or the player character is shown. Game resets immediately after this to the starting screen where you need to select the world.
http://www.vgmuseum.com/images/arcade/03/arcade3_0060_0003.png
So far done:
Heavy flickering of screen and colour distortion - another CRT synced with the PCB, colours ok after cleaning the jamma-connector
PCB was very dirty - removed the chips in sockets and washed the PCB, cleaned the chip legs - functionality before and after washing was exactly same
Game tests until I was sure that the game crashes only with this one stage (at least so far every time...)
ZR040P-2
SINGAPORE
That's all, nothing else. Any ideas if this chip is similar to any other type?
Couple of googlings revealed about nothing for this eprom, not many locations for getting one either.
At the moment game plays correctly (also sounds) until certain stage comes up, the opening screen (see link below) shows completely, but no enemies or the player character is shown. Game resets immediately after this to the starting screen where you need to select the world.
http://www.vgmuseum.com/images/arcade/03/arcade3_0060_0003.png
So far done:
Heavy flickering of screen and colour distortion - another CRT synced with the PCB, colours ok after cleaning the jamma-connector
PCB was very dirty - removed the chips in sockets and washed the PCB, cleaned the chip legs - functionality before and after washing was exactly same
Game tests until I was sure that the game crashes only with this one stage (at least so far every time...)
