Get a Mac with an NMI switch? Sometimes the machine is too far gone to respond to a serial BREAK or cmd-power.
Yes, the Quadra 605 isn't the best choice here...
Note that you need a recent netbsd-3 or current kernel to obtain a dump, and that mac68k coredumps have been hard to read for just about forever - see PR 9678. Ask Chuck Silvers, he knows how to make sense of them.
Yay! They're back! Thanks! I'll be sure to bug Chuck when I have a real crash dump.
Thanks, John