Apple Macintosh computers have used a startup chime since the 1980s to signal a successful hardware test on boot. The deeper, sustained version most people call retro was created by sound designer Jim Reekes in the early 1990s for models like the Quadra, recorded to sound reassuring rather than alarming. As those machines disappeared from desks, recordings of the chime spread through tech forums, YouTube restorations, and soundboards, where it now stands in for any nostalgic computer startup, even on non Apple setups.