Video "ringing" with PBXGA but not Mach64 or Elsa Gloria

From: Alan Frisbie (Usenet01REMOVE_at_Flying-Disk.com)
Date: 10/23/03 

Date: Wed, 22 Oct 2003 15:14:32 -0700

I just (sort of) resolved a nagging video problem with my
AlphaStation 200, and have a couple of questions.

It came with a PBXGA-BA/BN (ZLXp-E2) video card. If I
used an absolutely top-quality (e.g. expensive) video
cable, I got an acceptable 1280x1024 display on my ViewSonic
PS790 monitor, going through the BNC connectors.

If, however, I used a lesser-quality cable or tried to
route it through my Raritan MX48 KVM switch, I saw lots
of video "ringing". That is, every vertical line had
"echos" or "ghosts" to the right of it. I did not see
this on any of my other systems.

Since I did not see this problem on another Alpha with an
ATI video card, I tried switching to an ATI Mach64 video
card and the problem went away completely! Just to
complete the test, I also tried an Elsa Gloria Synergy II
card and it also worked perfectly. No ringing, even
with a cheap cable or going through the KVM switch.

What is it about the PBXGA/ZLXp-E2 card that causes this
ringing, that is not present with the other two cards?

On a related note, what video cards will work in the
AlphaStation 200? I have heard that some of the later
ones will not work with the EV4 CPUs. A matrix showing
cards, systems, and relative performance would be wonderful.
Does such a thing exist?

Thanks,
Alan Remove "REMOVE" from address to reply

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