no wrote:
>
> Jerome Fine wrote:
> >
> > >no wrote:
> >
> > > Pricey beasts, those bridges. Looked into that a few years ago when
> > > my company was thinking of replacing the 11/45's with the Osprey
> > > board. Unibus bridges were about $2500 each.
> > > -nick
> >
> > Jerome Fine replies:
> >
> > The price of the bridges has not been reduced, but the Osprey was a
> > relatively expensive solution - much more than the cost of the bridge
> > if I remember correctly. Also, limited in CPU power to the hardware
> > that is used. A less expensive solution - the difference effectively
> > makes the cost of the bridge zero or even negative - is Ersatz-11
> > http://www.dbit.com/
> > Obviously you require the commercial version and you still run on
> > a PC, but as the speed of the PC increases (at increased cost of
> > course), so does Ersatz-11. Not so with the Osprey hardware.
> > And I seem to remember that the cost without the bridge was twice
> > the cost of even the first the Ersatz-11 license.
> >
> > I am not saying that Osprey is a bad solution. When I first saw a
> > system that used the J11 chip (so that the speed was about identical
> > to an 11/93 - maybe a bit faster since the memory may have been
> > integrated more efficiently), I was very impressed. It was probably
> > about 5 or 6 years ago - well before the commercial version of
> > Ersatz-11 which initially arrived without an adapter capability.
> > Later, the Osprey solution started to use their own CPU to replace
> > the J11 - had to eventually since DEC cut off supply of the J11 chips.
> > But the Osprey is still much slower than Ersatz-11 is able to achieve
> > now on a Pentium IV. I think that on the fastest Pentium IV, Ersatz-11
> > is now able to execute PDP-11 instructions more quickly than any
> > other emulator and/or hardware. And since the original trial version
> > of Ersatz-11 is probably close to 10 years old, maybe I am not
> > even off topic.
> >
> > Does you company still have the PDP-11/45 systems?
> >
>
> Yes, but not for long. They are hooked up to a DC-10 flight simulator
> but
> part of the Sep 11 aftermath was the downsizing of the airlines and, in
> particular, the permanent grounding of our DC-10 fleet. Making this
> trainer irrelevant. Its about to be sold.
That would make a one of kind computer system -- DC-10 trainer -- for
the
den only $???,???.95 :)
--
Ben Franchuk --- Pre-historic Cpu's --
www.jetnet.ab.ca/users/bfranchuk/index.html
Received on Fri Dec 14 2001 - 15:03:09 GMT