grt@twitch.UUCP ( G.R.Tomasevich) (03/22/86)
> > The TRS-80 Model 1 used to put out so much RF interference, that one > > way of adding sound to ANY program was to put a small AM radio right > > by the machine, and listening to the electronic "music". Some The IBM 1620 was RF noisy, too, and of course it had no such thing as D/A. We would put am AM radio by it, too. Someone had written several pieces of music, which were available on decks of cards. Someone had even written a music compiler, which took notes, spelled out on cards, and produced the notes. I think, but am not sure, that that is how the composed pieces were done. This was at the Harvard Chemistry Dept. Many computers emitted a fair amount of RF from their console lamp drivers, including the HP 2115A, the Data General Nova 1200, PDP-11. Even modern equipment makes noise, sometimes audible. We have an 8088 processor pack in a frame powered by a Western Electric 484AA power converter. One can hear what the 8088 is doing by listening to the 484AA. -- George Tomasevich, ihnp4!twitch!grt AT&T Bell Laboratories, Holmdel, NJ