SIMH is an emulator which (among other things) can emulate a KA655
processor:
http://simh.trailing-edge.com/
I'm currently installing NetBSD 1.5.2 on it, and it works well so far.
--
Lars Brinkhoff http://lars.nocrew.org/ Linux, GCC, PDP-10,
Brinkhoff Consulting http://www.brinkhoff.se/ HTTP programming