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A series of personal computers sold by Tandy Radio Shack. The '80' refers to the use of Zilog Z-80 processor (NOT Intel 80x8x).

There were 7.5 computers in the TRS-80 line: Models I, II, III, 4, 100, 102, 200. The Model 4P was a portable version of the Model 4 with no tape drive -- only 2 1/2-height single sided disk drives.

Later models that Radio Shack produced were not TRS-80 machines -- they were based on the Intel 80x8x architecture. These included Tandy 1000, Tandy 2000, Tandy 3000, and others. The 1000 had a proprietary Color card. The 2000 was a powerful machine for its time, but was based on the Intel 80186, so when IBM didn't build a computer based on this chip, it failed. It was used to design a boat for the America's Cup.

The TRS-80 GUI, DeskMate, was proprietary, but no more than Windoze at the time.

Many joke about "TRaSh-80" machines but several models were in fact classics of their time.
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(Tandy RadioShack-80) An early line of personal computers from Tandy Corporation (later renamed RadioShack). In 1977, the TRS-80, along with the Apple II and Commodore PET, ushered in the personal computer revolution. The operating system for the TRS-80 was TRS-DOS, sometimes affectionately called "Trash-DOS." See RadioShack and personal computer. See also TSR.

The TRS-80
This ad suggested every home should have a TRS-80. At an initial price of USD $599, it was relatively affordable, and it contributed to the explosion of personal computers in the 1980s. (Image courtesy of RadioShack Corporation.)
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References in periodicals archive ?
My first computer experience was on a RadioShack PC TRS 80 Model with TRDOS and built-in GW BASICS.
To have been around long enough to recognise some of the early personal computers such as the Tandy TRS 80 and the Osborne `luggable' computer is a sobering experience!
There's a Commodore CBM model 8032, an Osborne 01, an HP 87, an Imsai 8080 from 1975 and an original Radio Shack TRS 80, which operated at 0.77 MHz with 4k of RAM.
Drawn to the systems side while running the St Lonis Globe Democrat's photo department, Jim Rentz developed software for Radio Shack's workhorse TRS 80 laptops.
Rentz left to work for a systems vendor, the Globe Democrat disappeared into a joint nonoperating agreement, and the TRS 80 faded in the face of more versatile and powerful notebook computers with bigger screens and far faster modems.