FPGA VAX update
shoppa_classiccmp at trailing-edge.com
Sun Oct 23 17:03:34 CDT 2005
Paul Koning <pkoning at equallogic.com> wrote:
> >>>>> "Michael" == Michael Sokolov <msokolov at ivan.harhan.org> writes:
> Michael> Chuck Guzis <cclist at sydex.com> wrote:
> >> If PC-based emulators are fast enough, why bother with the IC
> >> version?
> Michael> 2. A pee sea based emulator requires a pee sea. I refuse to
> Michael> contaminate my house with a pee sea.
> SIMH would run on a Mac, wouldn't it?
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
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
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