In a bid for the least impressive boot sequence, here the Epson TF-20:
http://fjkraan.home.xs4all.nl/comp/tf20/TF-20boot.avi
Why they gave the thing 64 kByte and not a proper firmware will probably
always be a mystery.
Have you looked at the hardware and the system tracks on the disk? This
thing, for all it claims to be the disk drive for the HX20, etc, is
actually a full Z80-based computer running something very close to CP/M
(!). I often wonder how hard it would be to use it as such (there's a
second serial poot too, if you need it).
-tony