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Re:Macintosh Startup Sound History [video] by kitsunesoba on Friday June 15, 2018 @01:12PM (#17321478)
Can sounds be played from EFI? It might be possible to create a stub EFI bootloader that does nothing but play the chime and kick off the normal macOS boot process.

EDIT: In fact I think Apple may have done something like this in their own EFI for the startup chime on Intel Macs – compared to PPC Macs, the sound was always a little delayed and clearly played further into the boot process.

Re:Macintosh Startup Sound History [video] by amyjess on Friday June 15, 2018 @01:50PM (#17321899)
Honestly, as much as the Mac startup sound makes me nostalgic, if I was going to go to that much effort, I might as well have it play the SGI Indy's glorious startup sound [0].

[0] https://www.youtube.com/watch?v=CH9saUP2460