Sound! | Classic retro game for the Commodore PET Computer (1979)

SOUND! is a small library of sound effects and short tunes to showcase the PET's CB2 sound capability. (The ! on the filename lets you know that SOUND! has sound, just in case there's any confusion.) The variety of sounds that the author was able to coax out of the PET's simple square-wave generator must have been impressive in 1979 (and it's still pretty nifty today). The program listing is a useful resource for programmers who want to learn more about CB2 sound, because each of the program's 17 sounds is created in a single, self-contained BASIC subroutine—no machine-language knowledge required.