The Computer History Simulation system is focusing its aim on SIMH, a portable multi system simulator which currently has support for a number of ancient machines.
Those include Data General's Nova and Eclipse; DEC's PDP-x and VAX systems; GRI's GRI-909; the IBM 1401, 1620, 1130 and System 3; Interdata's 16b and 32b; HP's 2116, 2100 and 21MX; the Honeywell H316; the MITS Altair 8800 (8080 and Z80 CPUs) and Scientific Data Systems SDS 940.
The group has also created Windows executables for all of its SIMH simulators and has available a number of software kits and tools. This picture below is a screen shot of PDP-1 simulation under Windows.
You can find more on this interesting project, here. ยต