Guys take a look at this qbus cpu board on Ebay :-)

From: Jerome H. Fine <jhfinepw4z_at_compsys.to>
Date: Thu Apr 18 21:21:56 2002

>"Zane H. Healy" wrote:

> >This isn't mine, but I wish it was :-)
> >http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2017593099
> >Chad Fernandez
> >Michigan, USA
> No kidding! However, keep in mind this is one of the older Mentec ones
> from the late 80's. The M1 is the board to have as it's ~4x the speed of a
> /93. Of course just about any Mentec CPU board would be nice, and I
> wouldn't mind having one. For a little info on Mentec boards take a look
> at http://www.mentec.com/mentecinc/processo.htm

Jerome Fine replies:

I doubt that the M90 is any faster than the DEC PDP-11/93 since both
use the same J11 chip.

Not the M1 is definitely faster, although I would not necessarily believe
the estimate that Mentec provides - DEC also used to exaggerate the
speed of a new board. Also, does anyone know the cost of the M1?

On the other hand, I am able to run at about TEN times the speed of
an 11/93 when I use just a Pentium III 750 under Windows 98 and
Ersatz-11. The hobby version of Ersatz-11 is free and even the
commercial version of Ersatz-11 is probably less (at $ US 2999)
than an M1 CPU.

Not that there is anything wrong with an M1 if a real PDP-11
Qbus system is required. But it is possible to use a PCI <=> Qbus
adapter when Ersatz-11 does not support the emulation of
specific PDP-11 modules that are required. In that case, the
increased speed of Ersatz-11 (up to TWENTY times the speed
of an 11/93 with a Pentium IV 2 GHz (sigh and yeck at the same
time) shows that software emulation has great advantages over
a hardware solution for some applications.

Sincerely yours,

Jerome Fine
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Received on Thu Apr 18 2002 - 21:21:56 BST

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