Discrete

The first generation of Solid State pinball, spanning roughly 1977–1990. Manufacturers built their own CPU boards from off-the-shelf microprocessors — the Motorola 6800, 6802, and 6803 families were ubiquitous — wired together with discrete logic on custom PCBs. Each company developed its own architecture independently: Williams had Williams System 3 through Williams System 9, Gottlieb had Gottlieb System 1 and Gottlieb System 80, Bally had its Bally AS-2518-17 series, Stern Electronics had Stern MPU-100 and Stern MPU-200.

Scoring displays progressed from Seven-Segment LEDs to Sixteen-Segment alphanumeric panels capable of showing text and simple animations. Sound evolved from basic tones to speech synthesis chips. Rules grew more complex with each generation, but the hardware remained fundamentally simple: a single-board computer running a program stored in ROM, talking to solenoid drivers and lamp matrices through direct I/O.

These machines represent the bridge between the relay logic of the Electromechanical era and the Integrated platforms that would follow. Every board was a bespoke design, and repairing them today requires component-level electronics knowledge that the later integrated systems largely abstracted away.