I know this would basically be a useless feature, except for scientific curiousity. I think it could be interesting to some people to see first hand what sort of errors that old faulty CPUs would produce.
Emulators for other faulty platforms might be interesting too. Not like I’d expect any programmers out there to deliberately write faulty instructions though, except as stated, something of a scientific exercise.
Just curious honestly.
This might be something PCem can do. LTT talked about it for emulating PC hardware (here) to install and play MS-DOS games accurately. I see someone in the PCem forum 10 years ago mentioning the recreation of FDIV bugs.