Derek Peschel wrote:
  But where is the microcode for the brain-damaged Nova
800 instruction set
 stored, and can it be overwritten? 
PROMs, and no, I know of no way to overwrite _that_ code.  Instead you
execute a load microstore operation, which moves data from memory to
microstore and resets the machine such that it begins execution from
soft microstore rather than the proms.
I'll have a look-see in the POP for the details.
--
Chris Kennedy
chris(a)mainecoon.com
http://www.mainecoon.com
PGP fingerprint: 4E99 10B6 7253 B048 6685  6CBC 55E1 20A3 108D AB97