FPGA VAX update

Chuck> Slightly OT: How fast (in comparison to the original 11/780) Chuck> do PC-based emulators run? My only close-up exposure with Chuck> this line was a couple of years with an 11/750. It didn't Chuck> seem like a speed demon then. An 11/780 is about the same speed as an 11/70, perhaps a bit less. And E-11 runs MUCH faster than an 11/70 -- maybe as much as 10x, I haven't done any benchmarks but it's very obvious when watching RSTS start up. Then again, E-11 is very carefully optimized. I'd expect that SIMH isn't quite as dramatic, though I'd guess that it too is faster. And given that the VAX instruction set is simlar to a PDP-11 in structure, the ratios should be comparable. (Yes, VAX has ultra-CISC instructions, but those are probably comparably slow.) paul