Commodore P.E.T
In 1977, when Commodore International unveiled its Personal Electronic Transactor, home computing barely existed. Computers remained the domain of universities, businesses, and a few enthusiasts capable of assembling complex kits. Jack Tramiel, Commodore’s boss, sensed an opportunity. Microprocessor prices were plummeting, and he envisioned a different device: a complete, ready-to-use computer in a single housing.
The P.E.T broke with everything that existed at the time. Gone were components scattered across multiple boards, gone the jury-rigged television screen and tape recorder diverted from its original purpose. Commodore integrated everything: processor, memory, 9-inch monochrome screen, keyboard, and cassette drive. This approach revealed an astute commercial vision. Where other manufacturers targeted electronics hobbyists, Tramiel aimed directly at future everyday users.
The machine’s heart beat to the rhythm of a MOS Technology 6502 processor running at 1 MHz. This technical choice, far from trivial, relied on the recognized qualities of this component: simple architecture, reduced cost, and honorable performance. The 4 KB RAM represented a reasonable compromise between functionality and cost. Moreover, Commodore offered enhanced versions with 8, 16, and 32 KB.
Microsoft BASIC resided in read-only memory, instantly transforming the P.E.T into a programmable machine upon power-up. This version of the language, adapted to the computer’s specificities, integrated commands dedicated to peripherals and the screen’s rudimentary graphics capabilities. Users could immediately type their first lines of code or load a program from cassette.
Storage posed a problem. Commodore’s Datasette, derived from a standard tape recorder, proved exasperatingly slow. Loading a program of a few kilobytes required long minutes of waiting, punctuated by characteristic beeps and squeals. Yet this solution remained the only economically viable way to democratize access to computing. Floppy disk drives still cost too much to equip households en masse.
Early users discovered the limitations of the original keyboard. Commodore had adopted the pocket calculator principle, with flat, closely-spaced keys that made typing painful. Complaints poured in, and the American firm corrected course by offering a full keyboard on subsequent models. This responsiveness to criticism demonstrated attentive market listening.
The P.E.T’s screen displayed 40 columns by 25 lines in green characters on a black background. No colors, no animated sprites like on future gaming machines. But this sobriety concealed unsuspected possibilities. Programmers ingeniously repurposed semi-graphic characters to draw shapes, create rudimentary interfaces, or design action games. The P.E.T also featured an optional high-resolution mode, MTU’s Visible Memory, which allowed individual control of each screen pixel.
In schools, the P.E.T found its place. Its robustness, reliable operation, and affordable price made it the ideal tool for introducing students to computing. Generations of students learned their first programming basics on these green and white machines. The IEEE-488 interface, inherited from the world of scientific instrumentation, enabled connection of professional measuring devices, extending the P.E.T’s use to laboratories and research centers.
The user community organized spontaneously. The P.E.T User Group emerged in 1978 and brought together thousands of members worldwide. Specialized publications, cassette program exchanges, regional meetings: a vibrant ecosystem developed around the machine. This collective dynamic compensated for technical limitations through overflowing creativity.
Independent developers created remarkable applications. VisiCalc, the first consumer spreadsheet, found in the P.E.T an ideal platform for attracting small businesses and independent professionals. Sophisticated games, management software, and educational tools progressively enriched the available catalog. This software diversity transformed the P.E.T from a programming computer into a genuine productivity tool.
Commodore learned lessons from this pioneering experience. The P.E.T’s successes and failures directly informed the design of the VIC-20 and then the legendary Commodore 64. The all-in-one approach validated, the importance of the price factor confirmed, the necessity of a robust software ecosystem understood: so many lessons that would guide the California company’s future creations.
The P.E.T gradually faded in the early 1980s, supplanted by more powerful and cheaper machines. This machine proved that a personal computer could appeal beyond the circle of initiates. It outlined a new market where technology yielded to usage, where complexity disappeared behind simplicity of use. The P.E.T fascinates collectors and computer historians. Not for its performance, long since surpassed, but for what it represents: one of the first steps toward democratizing the personal computer.