> 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.
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