[COFF] [TUHS] Monitoring by loudspeaker (was: BTL pranks)

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(This should probably be on COFF because I don't think this has much
to do with UNIX.)


On 11 Jul 2020 22:22 -0400, from doug at cs.dartmouth.edu (Doug McIlroy):
> a loudspeaker hooked to the low-order bit of the accumulator played
> gentle white noise in the background. The noise would turn into a
> shriek when the computer got into a tight loop,

How did that work? I can see how tying the low-order bit of the
accumulator to a loudspeaker would generate white noise as the
computer is doing work; but I fail to see how doing so would even
somewhat reliably generate a shrieking sound when the computer is in a
tight loop. Please, enlighten me. :-)

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Michael Kjörling • https://michael.kjorling.se • michael at kjorling.se
 “Remember when, on the Internet, nobody cared that you were a dog?”