I made a reproduction of the CPU suicide module found on Free Kick and Counter Run pcbs including the circuit for Hiscore saving using the external lithium battery
original module for reference:
Selling the naked pcb for 15€ + shipping.
I will provide BOM and files to program the ROM for Free kick and Counter Run and the GAL.
If you need it assembled with all components please drop me a msg to know the price.
4 pcbs are available