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Radio Shack TRS-80 Model 100

Computers in Collection

General Notes


AC adapter is Radio Shack part number 26-3804. It’s 6V DC at 400mA, with a 5.5mm outer diameter barrel plug, with the center “tip” conductor negative. The center pin on the jack was measured to be 2mm diameter. The CUI EPS060100-P5N appears to be a modern equivalent.

Fortunately, the computer is reverse-polarity protected, so I didn’t blow up my computer when I plugged in a more common tip-positive adapter. The path from the batteries to the computer is interrupted when a plug is inserted.

The Model 100 will not operate if the memory power switch (on the bottom of the computer) is set to “OFF”. If you’ve turned it on, and the computer still won’t respond, press the RESET button.

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