24847843%WSUVM1.BITNET@cunyvm.cuny.edu (Shawn Clabough) (10/13/88)
This isn't much of a benchmark, but it shows that the processor
accelerator does really speed up things. The other day I was backing
up a program with Marauder II and I noticed that the color scrolling
seemed faster than normal. Sure enough, when I timed the time it took
for a color to appear at the bottom of the screen and disappear from
the top of the screen it took 30 seconds in 7mhz mode vs. 16 seconds
in 14mhz mode. This is the biggest time difference I have found so far
between the two speeds.
A message to other PA owners:
When I received my PA, I had the green screen and crashing problems.
The cause of this is that the PA has very bad seating problems. It likes
to squirm out of the socket, enough to make bad contact and cause problems
with the system. To solve this, I scraped away a very thin layer on the
inside of the pins and pressed VERY hard when putting it in the socket.
It also helps to press down on the chips of the PA itself. I still have
problems every now and then, but I just press on the board again and it
works. This seems to remind me of the Agnes chip problems that some
owners had.
Does anyone know if there is a newer version since revision 3 of the PA?
I have that revision (3) and I was wondering if the problems might have
been solved with a newer revision.
Shawn Clabough
24847843@WSUVM1.BITNET
Washington State Universitybillsey@agora.UUCP (Bill Seymour) (10/15/88)
From article <4820@louie.udel.EDU:, by 24847843%WSUVM1.BITNET@cunyvm.cuny.edu (Shawn Clabough):
:
: Does anyone know if there is a newer version since revision 3 of the PA?
: I have that revision (3) and I was wondering if the problems might have
: been solved with a newer revision.
:
The revision 3 boards are the current boards for the 2000. We found
a layout problem on that board that was causing intermittent problems on
some 2000s when a math chip was installed. The solution was to re-route
that particular trace on the other side of the board, away from some other
traces.
The revision 4 boards are what we're currently shipping for the 500.
It has some extra circuitry to handle the differences in the 500s expansion
buss and internal architecture. If you are having seating problems on a 500,
look on the underside of the board and see if maybe there is a lead or two
that stick down too far. If one corner of the board is held up too high, you
could see that symptom. You might also check to see that that electrolytic
cap over by Agnus is laying over enough to give clearance.
Give me (or Lilliann) a call if you still have problems. (BTW, I
didn't realize it made that much of a difference with Marauder II colors.
Maybe I'll have to give that as a speedup example! :) :) )
: Shawn Clabough
: 24847843@WSUVM1.BITNET
: Washington State University
--
-Bill Seymour ...tektronix!reed!percival!agora!billsey
...tektronix!sequent!blowpig!billsey
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