Commodore Plus/4 Video Signal Refresh Rate Explained

This article examines the technical specifications of the Commodore Plus/4 computer, specifically focusing on the refresh rate of its video signal. Generated by the TED chip, the output frequency varied depending on the regional television standard, with PAL models operating at 50 Hz and NTSC models at 60 Hz. Readers will gain a clear understanding of the hardware differences between international versions and how these rates affect display compatibility.

The Commodore Plus/4, released in 1984, utilized the MOS Technology 7360 Text Editing Device (TED) chip to handle video and sound. Unlike the VIC-II chip found in the Commodore 64, the TED integrated more functions onto a single die. A critical aspect of this video generation was the vertical refresh rate, which synchronized the computer’s output with contemporary television sets.

For users in Europe and Australia, the Plus/4 was manufactured to comply with the PAL broadcast standard. Consequently, these units generated a video signal with a refresh rate of 50 Hz. This ensured stable imagery on PAL televisions without screen rolling or synchronization issues.

In contrast, units sold in North America and Japan adhered to the NTSC standard. These Commodore Plus/4 models produced a video signal with a refresh rate of approximately 60 Hz. This distinction is vital for collectors and enthusiasts using original hardware on modern displays or through capture cards, as mixing regions can result in monochrome output or timing errors.

Understanding these specifications helps preserve the authentic experience of the 264 series. Whether running software on original hardware or configuring an emulator, setting the correct refresh rate ensures accurate timing for music and visuals.