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

From: Alan Frisbie (Usenet01REMOVE_at_Flying-Disk.com)
Date: 10/29/03

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    Date: Tue, 28 Oct 2003 18:05:08 -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.

    > 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.

    BINGO! That was it! Even though an ohmmeter showed zero resistance
    between the three analog grounds (pins 6, 7, & 8), a small wire (I
    used 30ga wire-wrap wire) soldered across all three pins cured the
    problem. Now I can use the ZLXp-E2 at all 1280x1024 rates, including
    the most "agressive", setting 13 (80 KHz Horiz, 75 Hz Vert).

    I am now using it through my Raritan KVM switch and cables without a
    trace of "ringing".

    Hoff, do you suppose you could get this added to the FAQ or Wizard
    answers in case anyone else hits this problem?

    Thank you all for your helpful suggestions.

    Now I have just one remaining question: Why does "Style Manager - Color"
    not allow me to change colors (the "Modify" button is greyed out) with
    the ZLXp-E2, but does allow it with the Elsa and ATI boards?

    Alan

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