During referse negineering and measuring pin by pin ive found broken trace from Zorro pin 21 (adress line A5) to Autoconfig ROM (PAL1).
Now its soldered together (not really nice but works)
It was near zorro edge contact
it looks like OK, but it was under nonsoldering green mask andhere was 450 ohms dry joint. Bah!
Toccata is now repaired, fantastic! :banana: :banana: :banana:
Thanks for all advices goes to (in no order):
Wol (point to good book, i still want to uy it)
Doobrey (point me to Dave Haynie!s archive, excellent source)
Oliver Hannaford-Day (also suggested broken adress lines, point to reference zorro card)
:pint: beer for all!