> On Oct 17, 2016, at 5:29 PM, Kevin Handy <khandy2...@gmail.com> wrote:
> How close are the simh emulators to the real hardware's floating point? How 
> exct is the emulation of FPU's?
> Does simh emulate the real hardware close enough that you can use it to 
> analyze the original hardware floating point processors? (For those that 
> actually had FPUs instead of doing it in software).
> Or does it do it using "modern" methods (IEEE style FPUs) that could 
> calculate different results than the original hardware did?

I would hope not.  It's up to the individual emulator.  But a lot of machines 
have float designs vastly different from IEEE, possibly including more 
significant bits than commonly found, or much larger exponent ranges.

> It;s probably not a big deal for most users, but if the simh FPU hardware  
> might operate any different;y than the real hardware it should at least be 
> documented somewhere.

Yes, it would be good for the machine-specific document in the SIMH docs set to 
answer that question.


Simh mailing list

Reply via email to