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It was just a single pin on the timer chip connected to a buzzer so you could generate a square way at a certain frequency.

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But you could do a bit more. Here’s a DOS golf game that did.

https://m.youtube.com/watch?v=hMPb1UlSRpY

Probably use software to implement pulse width modulation. I knew even 8-bit computers where people would bit-bang PWN to produce audio. Its just that storing all that data would be a major constraint in such limited computers.

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