Looking for a small fast VAX development machine
holm at freibergnet.de
Sun Feb 21 14:26:05 CST 2016
Jerome H. Fine wrote:
> >Holm Tiffe wrote:
> >>Ben Sinclair wrote:
> >>I was just looking up VAXstations the other day on eBay. I checked
> >>again now for 4000's, and the prices seem crazy. Is there something
> >>particularly special about them, or is it just the usual eBay
> >..that are the smallest and fastest VAXen so it is not so unlikely
> >that the prices are crazy...
> >Why you don't use an simulator (E11, simh) for the job?
> That sounds like a good idea to use SimH for the VAXstation. However,
> I suspect that E11 (Ersatz-11) would be a bit difficult to use to emulate a
> VAXstation since E11 is exclusively for the PDP-11.
> As for the individual who mentioned the speed of an emulator, I have used
> both SimH and Ersatz-11 on a 750 MHz Pentium III. SimH probably runs
> at about the speed of a PDP-11/93, probably even faster. However, Ersatz-11
> runs 15 times as fast for CPU speed and about 100 times as fast for hard
> disk I/O.
> On a 2.83 GHz Q9550, Ersatz-11 ran about 100 times the speed of a PDP-11/93
> for the CPU and hard disk I/O was probably about 200 times as fast. As just
> one example, on a real DEC PDP-11/93 with ESDI hard drives, it took about
> 4 minutes to copy about 32 MB from one physical hard drive to a different
> physical hard drive. On the Q9550, it took less than 1 second. I was using
> RT-11 in all cases. I would assume that an I7 CPU would be somewhat faster,
> but maybe someone else has some benchmarks.
> Jerome Fine
Yes. Jerome he is right, he ist not intrrested in your great numbers since
hi want to emulate not a PDP11, but a VAX.
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