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