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