FPGA VAX update

[Paul Koning]

>>>>> "Chuck" == Chuck Guzis <cclist at sydex.com> writes:

 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