But then the question is as above ,how long will they live? they will go EOL !
So there was a possibility to do this !
1) Study of ROM addressing for integration of the entire program in a single EPROM.
2) Modification of the motherboard for using a single EPROM.
3) Reconditioning of the power supply.
4) Replacement of all electrolytic capacitors.
6) Re-soldering of some LEDs and connectors between PCBs.
7) Cleaning of LEDs, sensory board, casing, etc.
I can recommend Berger from Spain ,he is one of the best repair Mann i ever know !