SIMH is a simulator for historical computer systems.
It supports, among others, the following platforms:
* Data General Nova and SuperNova
* DEC PDP-1, PDP-4, PDP-7, PDP-8, PDP-9, PDP-10, PDP-11, PDP-15 and VAX
* IBM 1401 and System 3
* HP 2100
* MITS Altair
* SDS 940