MicroVAX I

From: Ethan Dicks <dickset_at_amanda.spole.gov>
Date: Sat Jan 10 17:20:39 2004

On Sat, Jan 10, 2004 at 03:38:40PM -0500, Brian Chase wrote:
> I just noticed something for the first time in my VARM. According to
> table 11.1, the MicroVAX-I supports the VAX's PDP-11 emulation mode.
> The only other models that also support this are the 11/7xx series, the
> 82xx, 83xx, and 86xx systems--and they're all rather larger than a
> MicroVAX-I.

There was a rumor going around the DEC community in 1984 that the uVAX-I
was so slow at running VAX instructions (0.3 VUPS, IIRC, slower than the
0.4 VUPS of an 11/725 or 11/730 ) that its PDP-11 emulation mode was

Nobody I know tried to verify it, though.

Also, I thought that the 86xx was the last series that supported emulation
mode. I didn't think the KA820 or KA825 processors (82xx/83xx) did. If
so, then most of my VAXen are on that list (all of them except the uVAX-II
and uVAX2000).


P.S. - long ago, we used to _use_ emulation mode at work... for playing
games from an RSX box for which we'd either lost or never had the source.

Ethan Dicks, A-130-S      Current South Pole Weather at 10-Jan-2004 23:10 Z
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Ethan.Dicks_at_amanda.spole.gov     http://penguincentral.com/penguincentral.html
Received on Sat Jan 10 2004 - 17:20:39 GMT

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