History

The Commodore Plus/4, released in 1984, was a home computer developed by Commodore International as a follow-up to the successful Commodore 64. It aimed to bridge the gap between low-cost home computers and more professional systems, but its market performance was underwhelming due to design compromises and competition.

Development and Background

• Context: Commodore, a leading player in the 1980s home computer market, sought to expand its lineup after the success of the VIC-20 and Commodore 64. The company aimed to create a machine that could appeal to both home users and small businesses, competing with systems like the Apple II and IBM PCjr.
• Design Goals: The Plus/4 was part of Commodore’s TED (Text Editing Device) series, which included the Commodore 16 and 116. The goal was to produce a cost-effective computer with enhanced graphics and sound capabilities, targeting productivity and educational markets.
• Development: The Plus/4 used the MOS Technology 7501 (or 8501) CPU, a derivative of the 6502 used in earlier Commodore systems, running at 1.76 MHz (NTSC) or 1.77 MHz (PAL). It was designed to be cheaper to produce, using the TED chip to handle both video and sound, reducing component costs.