Which Chipset Was Designed for Commodore 16 and Plus/4?

The Commodore 16 and Plus/4 computers represent a unique chapter in 8-bit computing history, distinguished by their specialized hardware architecture. This article explores the specific integrated circuit designed to power these machines, known as the TED chip. Readers will learn about the technical capabilities of this chipset, how it differed from the popular VIC-II found in the Commodore 64, and why it was crucial for Commodore’s cost-reduction strategy during the mid-1980s.

The specific chipset designed specifically for the Commodore 16 and Plus/4 line is the MOS Technology TED, officially designated as the 7360. TED stands for Text Editing Device, and it was a custom chip created to integrate multiple functions into a single package. Unlike the Commodore 64, which separated video and audio into distinct chips like the VIC-II and SID, the TED chip combined video display generation, sound synthesis, and DRAM refresh logic. This high level of integration allowed Commodore to reduce the overall component count and manufacturing costs for the 16 and Plus/4 models.

In addition to the TED chip, the system utilized a variant of the 6502 processor, specifically the 7501 or 8501 CPU. However, the TED remains the defining component of this architecture. It supported a palette of 121 colors and offered text modes optimized for business applications, aligning with the Plus/4’s marketing as a productivity machine. While it lacked the sprite capabilities and advanced audio of the Commodore 64, the TED chipset provided a stable and efficient foundation for the entry-level systems.

Ultimately, the TED chip stands as the hardware hallmark of the Commodore 16 and Plus/4 series. Its design prioritized integration and economy over the graphical flair of its predecessors. For historians and retro computing enthusiasts, identifying the TED chipset is key to understanding the technical identity of these often-overlooked machines.