I have a SPace Invaders board, Model Racing version.
Actually I dunno which game was installed on but I burned new 2708 (yes, uses 2708) taken from MAME and I used my spare logic board.
The game worked fine for 20 minutes and then the scree became dark.
I have activity on rams and toms but nothing on the screen.
Do you know if MR version schematics are available somewhere?
Any idea about the problem?
thank you