Re: SEGA G80 - Star Trek Draw Problem..

From: Kevin Moore <talon.k_at_gmail.com>
Date: Mon Apr 02 2012 - 17:22:50 EDT

The only time I've seen anything similar it was a ha color ram but then
that was in a tempest.
On Apr 2, 2012 4:14 PM, <kstillinger@sc.rr.com> wrote:

> That's a pretty odd one.
>
> Your description makes it sound like the vectors are still in the output,
> but without color information.
>
> I don't know what would cause this, especially on a single color and on
> ONE section of the screen.
>
> I've seen some boards that still put out the XY signals, but if the color
> is missing, nothing shows up.
>
> Kerry
>
>
> ---- Arcadius Stempak <arcademanx@yahoo.com> wrote:
> > All,
>
> After some troubleshooting into this issue (which affects the G80 -
> Control Card - only),
> I was wondering if anyone else may have run into this, since I am pretty
> much out of ideas.
>
> Ok so here is the scenario..
>
> Original problem:
> Complete lack of the color Green - missing lines - since resolved by
> replacing U2 on the Control Card.
>
>
> Current problem:
> While the color Green is now present in the middle and lower sections of
> the Monitor
> (imagine diving the screen into 1/3 rd's) and there is no problem with
> Line Draw, etc.
>
> Main problem is that the color Green is missing (not at all present and
> all Green Lines are not being Drawn
> in the Upper 1/3 rd of the screen). This includes the Gauge on the Upper
> left hand side of the screen, which is
> also missing the Green Lines and Triangle indicator.
>
> However, when I hook up the X/Y Outputs to an Oscilloscope All Lines are
> present (but only in black and
> white).
>
> Also swapping Control Cards with a Good Set - displays All lines / Colors
> correctly - so not a monitor issue.
>
> After replacing the Memory (which did not change anything), any ideas as
> to what could be causing this issue?
> Or better yet what on the Control Board, corrolates to ' Draw ' and the
> color ' Green ' / upper 1/3 or the screen ?
>
> Appreciate your help,
>
> Regards,
> _Arcadius
>
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Received on Mon Apr 2 17:22:59 2012

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