[ih] Recently restored and a small ARPANET was run using simulated IMP hardware.

[David Walden]

Not so recent -- 2013.

>I believe this is the software:
>https://www.walden-family.com/impcode/
>And here's information about the simulation:
>https://github.com/simh/simh/blob/master/H316/tests/00readme.txt