I am a little concerned about the ground return path for the coin 
counters on these games. The power comes from the audio board analog 
power, and the darlington switch is on the multisync board. The 
ground return goes through the serial interface (SCOM) signal ground wire.

Even though it is contra DFM, for these two games I think we should 
use 5 volt coin counters, and drive them from the logic +5v supply 
located conveniently nearby at the coin door.

							Pat.