10 Jan
2004
10 Jan
'04
5:20 p.m.
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
faster.
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).
-ethan
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
South Pole Station
PSC 468 Box 400 Temp -14.4 F (-25.8 C) Windchill -38.7 F (-39.3 C)
APO AP 96598 Wind 8.5 kts Grid 076 Barometer 686.8 mb (10369 ft)
Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html