Variations of this sound were deployed until Jim Reekes created the startup chime in the Quadra 700 through the Quadra 800.
Mark Lentczner created the software that plays the arpeggiated chord in the Macintosh II. The first sound version in the first three Macintosh models is a simple square-wave 'beep', and all subsequent sounds are various chords. The specific sound differs depending on the ROM, which greatly varies depending on Macintosh model. The sound indicates that diagnostic tests run immediately at startup have found no hardware or fundamental software problems. The Macintosh startup chime is played on power-up, before trying to boot an operating system.
