Quoted from ShootForSlrValue:what the purpose of the PIA was. I've looked around on pinball news and a few other places and can't seem to find a solid answer.
PIA stands for peripheral interface adapter. The CPU board "sees" the driver board as an Output device for firing the solenoids. When the CPU wants to fire a solenoid it sends signals across the 40pin connector data bus. The 40pin connector allows CPU board to communicate with the driver boards using TTL level (0 or +5v) signals. From there the PIA IV sitting on driver board will look at the blanking circuit and input from CPU board (both are needed) and fire the appropriate solenoid.
Woodstock, GA
