PET 2001
A Commodore PET 2001
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| Manufacturer | Commodore International |
|---|---|
| Type | Personal computer |
| Release date | October 1977 |
| Discontinued | 1982 |
| Operating system | Commodore BASIC 1.0 ~ 4.0 |
| CPU | MOS Technology 6502 @ 1 MHz |
| Memory | 4 — 96 kB |
| Storage | cassette tape, 5.25" floppy, 8" floppy, hard disk |
| Display | 40×25 or 80×25 text |
| Graphics | monochrome character graphics |
| Sound | none or beeper |
| Successor | Commodore CBM-II |
The Commodore PET (Personal Electronic Transactor) is a line of home/personal computers produced starting in 1977 by Commodore International. A top-seller in the Canadian and United States educational markets, it was Commodore's first full-featured computer, and formed the basis for their entire 8-bit product line, including the Commodore 64. The first model, which was named the PET 2001, was the third personal computer ever made available to retail consumers, after the Apple II and TRS-80.
In the 1970s Commodore was one of many electronics companies selling calculators designed around Dallas-based Texas Instruments (TI) chips. However, in 1975 TI increased the price of these components to the point where the chip set cost more than an entire TI calculator, and the industry that had built up around it was frozen out of the market.
Commodore responded to this by searching for a chip set they could purchase outright. They quickly found MOS Technology, which was in the process of bringing its 6502 microprocessor design to market, and with which came Chuck Peddle's KIM-1 design, a small computer kit based on the 6502. At Commodore, Peddle convinced Jack Tramiel that calculators were a dead-end. In September 1976 Peddle got a demonstration of Jobs and Wozniak's Apple II prototype, when Jobs was offering to sell it to Commodore, but Commodore considered Jobs' offer too expensive. Tramiel demanded that Peddle, Bill Seiler, and John Feagans create a computer in time for the June 1977 Consumer Electronics Show, and gave them six months to do it. Tramiel's son, Leonard, helped design the PETSCII graphic characters and acted as quality control. The result was the first all-in-one home computer, the PET, the first model of which was the PET 2001. Its 6502 processor controlled the screen, keyboard, cassette tape recorders and any peripherals connected to one of the computer's several expansion ports. The PET 2001 included either 4 kB (2001-4) or 8 kB (2001-8) of 8-bit RAM, and was essentially a single-board computer with discrete logic driving a small built-in monochrome monitor with 40×25 character graphics, enclosed in a sheet metal case that reflected Commodore's background as a manufacturer of office equipment. The machine also included a built-in Datasette for data storage located on the front of the case, which left little room for the keyboard. The data transfer rate to cassette tape was 1500 baud, but the data was recorded to tape twice for safety, giving an effective rate of 750 baud. The computer's main board carried four expansion ports: extra memory, a second cassette tape recorder interface, a parallel ("user") port which could be used for sound output or connection to "user" projects or non-Commodore devices and a parallel IEEE-488 port which allowed for daisy-chaining peripherals such as disk drives and printers.
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