> 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. paul _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh