Radio Shack's TRS-80 selling for about $500 complete with video monitor and BASIC took the personal computer market by storm. Using a fast Z-80 processor it use a cassette recorder for program and data storage. Later models incorporated disk drives and more memory. the Model III, housed in one case became the most popular personal computer in schools and homes rivaling the Apple II. Radio Shack also built other types of personal computers including the first practical laptop, the Model 100.
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