Simh is not just an emulator, it's actually a set of emulator, that emulate a number of ancient machine, that I wanted to get a hand on. Such as a PDP-11, which is used to run the first UNIX.
And to install it on ubuntu is again a matter of
sudo apt-get install simhWhat make it interesting is that, each machine emulated is represented as an executable, so calling an emulator, is a matter of calling the right program, for example, running an altair is a matter, of running the program, altair on linux, altair.exe on windows.
And there is a windows version too. One reminder, it only provide the emulator not the os and program.
The links provide the emulator, source code, and windows executable.
There is links to the program that are needed to make the emulator useful