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Altair 680

CBM PET 2001/8k

TRS-80 Model I

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TRS-80 Model 4

TRS-80 Model 4p

TRS-80 Model 2000HD

Apple ][+

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Apple Macintosh 512k

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TRS-80 Model III

Introduced:
CPU:
RAM:
ROM:
Disk Storage:
Operating System:
Language:

 July 1980
Zilog Z80
16k, 32k, or 48k
16k
160k per side
TRS-DOS 1.0 to 1.3
Microsoft BASIC

In July 1980, due largely to new FCC regulations on radio-frequency emmisions which the Model I flunked, Tandy released the Model III. The Model III was little more than a Model I, expansion interface, monitor, disk drives (optional), and power supply thrown into a single enclosure. This new design moved the computer from the hobbiests' realm into the plug-and-run realm more suitable for businesses and schools.