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Preceding both the Internet and the bulletin board system ( BBS ), PLATO was created by Professor Don Bitzer at the Urbana-Champaign campus of the University of Illinois and was further developed by other university faculty and students.

The current software-based version of the system is available from PLATO Learning.

Some models used low-end versions of the same CPU as the terminal server; the 2000F, for instance, used a 2100S as the main CPU and primary storage controller, while a 2100A acted as the terminal server. 15 The B, C F models were dual-processor.

Tens of thousands of machines in the series were sold over its twenty-five year lifetime, making HP the fourth largest minicomputer vendor during the 1970s.

HP purchased the company in 1964 and merged it into their Dymec division.

The original model, the 2116A built using integrated circuits and magnetic-core memory, was released in 1966.

Over the next four years, models A through C were released with different types of memory and expansion, as well as the cost-reduced 2115 and 2114 models.

All of these models were replaced by the HP 2100 series in 1971, 1 and then again as the 21MX series in 1974 when the magnetic-core memory was replaced with semiconductor memory.

HP Time-Shared BASIC was popular in the 1970s, and many early BASIC programs were written on or for the platform, most notably the seminal Star Trek that was popular during the early home computer era.

The Peoples Computer Company published their programs in HP 2000 format.

This was the first version to break backward compatibility with previous 2100-series expansion cards.

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The final upgrade was the A-series, with new processors capable of more than 1 MIPS performance, 3 with the final A990 released in 1990.

Their original logo was simply the HP logo turned upside down, forming something approximating dy and thus inspiring the name.

Learning that Westinghouse owned a trademark on that name, in 1958 they changed it to Dymec.

The company was brought in-house in 1959 to become the Dymec Division, and in November 1967 was renamed the Palo Alto Division.

In 1964, Kay Magleby and Paul Stoft began experimenting with the use of PDP-5 and PDP-8 computers to act as controllers for their complex test systems, but they felt the machines would require changes to truly suit their needs.

At the time, Digital Equipment Corporation (DEC) was still a small company and a takeover target.

David Packard found Ken Olsen too difficult to deal with, and such plans went nowhere.

Bill Hewlett initially refused to consider the development of a minicomputer, but when Packard reframed it as an instrument controller the deal was approved.

The system featured an oversized cabinet that held up to 16 expansion cards, or could be further expanded to 48 cards with an external expansion cage.

An additional set added inputoutput devices like tape drives, printers, punched cards and paper tape and other peripherals.

Real-time service was provided by having each card slot be assigned a fixed interrupt vector that called the appropriate device driver.

This led to the introduction of the 2115A in 1967, which removed much of the expansion capabilities to make a lower-cost offering for commercial users.

A further simplified version shipped as the 2114A in 1968, 5 which had only eight slots, leaving room for the power supply to be incorporated into the main chassis.

The 2115 and 2114 also lacked the extensive DMA control of the 2116, removed some of the mathematical operations, and ran at slightly slower speeds.

Normally supplied with 4k words, expandable to 8k internally or 16k with an external memory system.

This was based on the 2116B (a 2116A with an expanded 8k core memory) running HP Time-Shared BASIC and used a separate 2114 as a terminal server.

T-S BASIC allowed multiple user accounts to be created 14 with up to 16 users logged in at once.

The B, C F models were dual-processor.