BallyFA - a Bally MPU based on a low cost FPGA
This is a 1:1 functional replacement to a original Bally MPU, without the additional features of a LISY35, but with much faster boot and lower costs. You can build a BallyFA for less than 50 Euros!
Current prototype is working, tests running.
The current prototype is missing the storage of the Highscores and extended settings and you need to do a new programming of the FPGA each time you change the game. I'm working on that. The final version is planed to have all roms on SD card; with that game selection can be done via DIP Switch.