[LargoLasskhyfv]

Maybe something very similar,

[1] https://en.wikipedia.org/wiki/Amdahl_UTS

[2] https://github.com/moshix/UTS

which runs under

[3] http://vm370.org/

as shown in these two videos:

[4] https://www.youtube.com/watch?v=k56qLxG-sUM

[5] https://www.youtube.com/watch?v=iFUHwkbVTJg

I didn't try it by myself, so far. Though I'm very tempted.

Maybe this could work for you, or rather your father.

[LargoLasskhyfv]

Thinking about it, since it will be running under Windows, maybe this would be a nice touch:

[6] https://ollydbg.de/Jason/index.htm