Re: Video "ringing" with PBXGA but not Mach64 or Elsa Gloria
From: Alan Frisbie (Usenet01REMOVE_at_Flying-Disk.com)
Date: 10/27/03
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Date: Mon, 27 Oct 2003 08:08:29 -0800
Rich Jordan wrote:
>> Alan Frisbie <Usenet01REMOVE@Flying-Disk.com> writes:
>>> 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?
> The ZLXp-E2 card (maybe others in the series) reportedly originally
> came with a monitor cable that grounded one of the three color signal
> grounds, or was used with a monitor that performed the same function. If
> you scope the card, I believe two of the three color signal ground wires
> (red and blue if I recall correctly) are grounded, while the third
> (green?) ground is floating.
>
> My AS200 is running and I can't take it apart right now, but it has an
> -E2 card in it that I modified; I soldered a wire-wrap wire from the
> floating (green?) signal ground to 'another' ground on the backside of
> the card, where the HD15 connector was attached. I no longer have the
> reference, and I really can't take the system down to check, sorry. But
> that cleaned up the fringing and gave me a rock solid display on just
> about any monitor I cared to try it with.
Thanks for the note. My board is a Revision D04, and a quick ohmmeter
check shows that all three analog ground pins (6, 7, & 8) are all
connected to ground. Perhaps they caught this goof and fixed it.
I still haven't tried Hoff's suggestion (use a less "agressive"
scan rate), but I will this evening. In the meantime, the Elsa
board is working fine.
Thanks,
Alan
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