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Not bad, but that C64 demo sounds clearly better. C64 can have something between 6-8 bits of resolution per sample using a trick invented by Mahoney (https://livet.se/mahoney/c64-files/Musik_RunStop_Technical_D...).

Mostly I remember this type of sound, even at higher sample rate: https://www.youtube.com/watch?v=1fErwWtkMS4

I wrote a noise shaping PC-beeper PWM converter in the nineties, oversampling at maybe 500 kHz or so. It still sounded very tinny. (First version was without shaping, and it had an annoying high frequency pitch.)

> Basically; the faster the PC, the higher the sampling rate you can go.

Not really, io-port (outb) encounters a brick wall pretty early. So no matter how fast the CPU is, you can't toggle the speaker any faster.