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What Early PC Had An Unofficial “Sound Card” Driven By Excessive Radio Interference?
The BBC Micro
The Apple II
The Atari 400
The Tandy TRS-80 Model I


Answer: The Tandy TSR-80 Model I

Early computers lacked discrete sound cards/modules and often times didn’t even sport a simple on-board PC speaker. That didn’t stop early PC enthusiasts from enjoying sound, however indirectly and unintentionally, with an early model personal computer.

The Tandy TRS-80 Model I was manufactured by the Tandy corporation and sold by Radio Shack from 1977 to 1981. Hobbyists quickly discovered that if you placed an AM-band radio next to the computer it would generate sound. The sound wasn’t encoded into the programs or even an intentional feature included with the computer.

The Model I was so poorly shielded and generated such high levels of radio interference that placing a radio near the unit created quite an array of sound effects. The interference-drive sound effects clearly didn’t align themselves with most applications but were a surprisingly good match for early space-based games.

Although the model was a popular one, ultimately selling over 200,000 units, it was removed from the market in 1981 on account of aging hardware and stricter FCC regulations on radio interference that would require significant design changes.

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