Hi all,
The project has been practically completed. I checked - it works. i immediately formatted Flash and transferred OS 2.0. Now the sampler starts in almost no time

You see floppydisk ejected.
https://reversing.pl/projekty/fmx008/fmx008.htmlBelow some photos:

SYSTEM BOOT




Personally, I will not build clones for the willing for various reasons (age, health an so on...) but nothing prevents someone else from doing it. just ask first formally for permission to use the prepared documentation.
As always - I give everything for free. May AKAI live happily ever after.
Cheerz
tOri
P.S. if anyone has a Yamaha SY99 and would like to do a firmware upgrade to version 1.57 then I could also help for a reasonable fee...