This Zaccaria board set is comprised of a single large main circuit board containing the processor (a National Semiconductor 8060), RAM (2 x 5101), ROMs (4 x 2708), lamp and solenoid drives, switch matrix, and power supply. A ribbon cable connects to a single display.
A single display, encompassing score, credit, and ball-in-play on one board.
These games used a phototransistor and a light bulb to form a simple opto-electronic coin switch on the coin door.
Pictures by Laszlo