Tony Duell replied to my message about the HP-10:
Ouch... Actually, I can't think of a hackish (as
opposed to collector's)
reason for wanting one. But then I'm not a collector.
What, dumping the microcode isn't hackish enough? Geez, tough crowd!
http://www.brouhaha.com/~eric/hpcalc/nsim/
http://www.brouhaha.com/~eric/hpcalc/csim/