FPGA VAX update

Paul Koning <pkoning at equallogic.com> wrote: SIMH will run on a VAX, in fact :-). Getting back to FPGA's, I know of a couple FPGA implementations of PDP-11's. (They are mostly KDJ11 clones, but they differ in a couple of tiny respects.) With extreme effort in the late 90's, they managed to make 4 FPGA's be about a factor of 2 factor on most benchmarks than a 11/93. By the time the FPGA implementations made it to market the PC-based emulators were so much more cost-effective for most applications (despite their warts of running under a host OS...) I suspect that a FPGA implementation of a VAX would have a performance about equal to a 11/780 if done by an average Joe. Someone with much experience in caching/pipelining could probably eek out a factor of 2x or 3x by pulling out all the tricks in the book. Tim.