Originally Posted by Bavarese
@R.Belmont & O.Galibert: i made a partial disassembly of the Z80 part (located at the end of the Rainbow-100 B BIOS).

Sector reads & writes are handled there - as far as the BIOS is concerned.

Perhaps we find out what's wrong with the timing?

(you may want to search for WRITE_SECTOR)

Thanks for having a look.

I don't suppose there's a central repo (ala github or similar) that contains the accumulated disassembly of these ROMs?