Ported line-for-line from the shell that OpenBIOS copies to 0x80030000 at boot —
same 24-bit fixed point, same 2048-step cosine table, same Graham-scan hull every five seconds.
The music is the real blip.hit module, an eight-channel tracker song with
ADPCM samples, and each state jumps it to a different pattern. The buttons say what is
in the drive; the CD-ROM state machine runs for itself, which is why an empty drive
keeps retrying rather than settling. Source available on GitHub