TRS-80 Microcomputer System Model III

TRS-80 Microcomputer System Model III

The Model III is basically an upgrade of the Model I, which was released three years earlier. It has the same CPU, but it is faster, has more memory, and the floppy drives hold twice as much data, although the Model I could be upgraded to some of these features.

The major reason for developing the Model III was because the FCC had just instituted new regulations about RF emissions generated by computers and other electronic devices. The Model I was completely unshielded and was unable to pass the emission restrictions.

The Model III system is entirely self-contained. The original Model I had edge-type connectors with ribbon cable connecting the keyboard to the (optional) Expansion Interface, as well as the floppy drives. This type of connection is very unreliable, and led to the occasional system crash or lock-up.

Introduced July 1980

The improvements of the Model III included built-in lower case, a better keyboard, and a faster (2.03 MHz) Z-80 processor.

Manufacturer: Radio Shack
Date: July 1980

Other Systems Related To TRS-80 Microcomputer System Model III:

Item Manufacturer Date
TRS-80 Microcomputer System Model 1 Level 1 Radio Shack - Tandy 1977
TRS-80 Microcomputer System Model I 16k Level II Radio Shack 1978
TRS-80 Microcomputer System Model II Radio Shack 1979
TRS-80 Microcomputer System Model I Radio Shack 1st January 1979
TRS-80 Pocket Computer PC-1 Radio Shack July 1980
TRS-80 Microcomputer System Model III Radio Shack July 1980
TRS-80 Model 100 Portable Computer Tandy Radio Shack 1983
TRS-80 Model 102 Portable Computer Tandy Radio Shack 1983
Tandy 102 Portable Computer Tandy Radio Shack 1983
TRS-80 Colour Computer 2 Radio Shack Tandy 1983
TRS-80 MC-10 Micro Color Computer Radio Shack 1983
Tandy 1000 Professional computer Radio Shack 1984
Tandy Portable Wordprocessor WP-2 Radio Shack 1989
Tandy 1100FD Laptop Computer Tandy Radio Shack November 1989

This exhibit has a reference ID of CH41385. Please quote this reference ID in any communication with the Centre for Computing History.

 

TRS-80 Microcomputer System Model III


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