Beginning with Williams’ Williams System 11 in 1986 and reaching full maturity with the Williams WPC Dot Matrix platform in 1991, the integrated era saw pinball hardware consolidate into cohesive, purpose-built computing platforms. Instead of discrete CPU boards wired to separate sound and display circuits, manufacturers designed tightly integrated systems where CPU, sound, display controller, and I/O were engineered as a unified whole.

The Williams WPC platform — spanning Williams WPC Alphanumeric through Williams WPC-95 — defined the era and produced many of the most celebrated pinball machines ever made. Its Plasma display enabled animations and storytelling that transformed the medium. The DCS sound system delivered CD-quality audio. Software complexity exploded: Multiball stacking, wizard modes, deep rule sheets that rewarded hundreds of hours of play.

Data East, Sega, and Gottlieb (as Premier Technology) developed their own integrated platforms during this period. Stern’s Stern Whitestar and Stern SAM systems carried the approach into the 2000s and 2010s. The defining characteristic of the era is purpose-built pinball hardware designed as a platform — a stable foundation that could host dozens of different game designs without redesigning the electronics for each title.