Hi, Seems that SIMH/PDP11, p11 and ts10 do not simulate older PDP-11's They appear to cover only /*3 (/23, /53, /73, etc) models. Am I wrong about this? Are there any open source emulators for the /40, /45, or /70? I know about Charon and Esatz. Thanks, Ken __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com