[Let's] talk about non-broken tools so that we can
run the old
 machines properly like a terminal emulator that works like a real
 terminal? 
I built a terminal emulator for X that is pretty close to a VT-100.
There are closer VT-100 emulators out there - or so I'm told; I've
never bothered to go look, since my own works well enough for what I
use it for.
I believe there are people here who have come substantially closer than
I to the real thing; indeed, there is likely someone, perhaps even here
on this list, running real terminal firmware under emulation.
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