SIMH is the most comprehensive package for emulating ancient systems.
SIMH can emulate the following systems:
- Data General Nova, Eclipse
- Digital Equipment Corporation PDP-1, PDP-4, PDP-7, PDP-8, PDP-9, PDP-10, PDP-11, PDP-15, VAX
- GRI Corporation GRI-909, GRI-99
- IBM 1401, 1620, 1130, 7090/7094, System 3
- Interdata (Perkin-Elmer) 16b and 32b systems
- Hewlett-Packard 2114, 2115, 2116, 2100, 21MX, 1000
- Honeywell H316/H516
- MITS Altair 8800, with both 8080 and Z80
- Royal-Mcbee LGP-30, LGP-21
- Scientific Data Systems SDS 940
I do maintain binary builds, along with software on sourceforge here.