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If you like this sort of weird bit operations, you should check out HAKMEM, a huge list of hacks created at MIT in 1972.

"Here is some little known data which may be of interest to computer hackers. The items and examples are so sketchy that to decipher them may require more sincerity and curiosity than a non-hacker can muster. Doubtless, little of this is new, but nowadays it's hard to tell."

https://w3.pppl.gov/~hammett/work/2009/AIM-239-ocr.pdf - see e.g. page 79

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I love the curiosity/hacking of the early days of computing, hooking up your registers to an audio amplifier? sure!

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This is a display hack (that is, it makes pretty patterns) with the low 9 bits = Y and the 9 next higher a X; also, it makes interesting, related noises with a stereo amplifier hooked to the X and Y signals.

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I would also recommend Bit Twiddling Hacks By Sean Eron Anderson [1] and Hacker's Delight.

[1] - https://graphics.stanford.edu/~seander/bithacks.html

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