The drive kernal ROM ("ProfessionalDOS-Release-0x6000-0x7FFF.rom" and
"Professional-DOS 1541N L1 01.01.1988 - C1541 expansion EPROM 27128.rom")
is corrupted, it seems that the EPROM was not read out with an EPROM burner,
but with a dumping tool from the drive memory. Simple dumping tools are
_definetly_ not sufficient to read out the contents of the drive kernal ROM,
because the hardware circuits of the expansion board _scramble_ the data of
the GCR conversion tables. Without taking into account the internal 4-Bit
register of the Professional-DOS hardware on every access to the GCR tables,
wrong contents are dumped.
