Looking for a small fast VAX development machine

Holm Tiffe 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
> >>craziness?
> >>
> >..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.



      Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, 
     Freiberger Straße 42, 09600 Oberschöna, USt-Id: DE253710583
  www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741

More information about the cctalk mailing list