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Tandy TRS-80 Model 4

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description Tandy TRS-80 Model 4 Overview

The Tandy TRS-80 Model 4 is an 8-bit desktop computer released by Tandy Corporation in 1983 as the successor to the Model III. Powered by a Zilog Z80 processor, the machine shipped with a built-in keyboard, a monochrome monitor, and supported a maximum of 128KB of RAM. It offered backward compatibility with earlier TRS-80 models while providing dual floppy disk drives and an expanded operating system environment. The computer was marketed toward small businesses and educational institutions during the early 1980s personal computing boom.

help Tandy TRS-80 Model 4 FAQ

When was the Tandy TRS-80 Model 4 released?

Tandy introduced the TRS-80 Model 4 on April 26, 1983, as the successor to the Model III. It kept the Z80 family architecture while adding a faster processor mode and expanded memory options. [TRS-80 Model 4 history](https://www.trs-80.org/model-4/)

How fast is the TRS-80 Model 4 and how much RAM does it have?

The Model 4 uses a Z80 processor running at 4 MHz and can be configured with 64 KB or up to 128 KB of RAM. That was a major step beyond the earlier Model III for programs that could use banked memory. [TRS-80 Model 4 reference](https://www.trs-80.com/sub-models-model4.htm)

Which operating system did the TRS-80 Model 4 use?

Disk-equipped Model 4 systems commonly used TRSDOS 6, with Disk BASIC also available for programming. The computer could enter a Model III compatibility mode for older operating systems and software. [TRS-80 Model 4 documentation](https://www.trs-80.com/sub-models-model4.htm)

Can a TRS-80 Model 4 run Model III software?

Yes, backward compatibility with Model III operating systems and applications was one of the Model 4's important features. Programs that depend on unusual Model III hardware may still need testing, but ordinary Model III software was the intended compatibility target. [TRS-80 Model 4 reference](https://www.trs-80.com/sub-models-model4.htm)

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