Re: Slow Vectors???

I'll check on this to.

Thanx!!

John Robertson <jrr@flippers.com> on 11/16/99 05:20:11 PM

Please respond to vectorlist@lists.cc.utexas.edu

To: vectorlist@lists.cc.utexas.edu
cc: (bcc: Mendel Pearl/Matra exiTel/nl)
Subject: Re: Slow Vectors???

I don't have a schematic but is the CPU interrupt driven? It might be that
the clock for the interrupt is wrong.

John :-#)#

At 01:20 PM 11/16/1999 +0100, you wrote:

>Ok, I am still working on my Tempest, and I found out the AVG circuitry is OK,
>at least everything from the three DAC's, and the DAC's itself.
>
>I can see all the graphics, but it looks like they are drawn too slow!
>(the spot
>killer flashes on-and of).
>In normal play mode, you can hardly recognise it is tempest (screen is like
>'zooming' in and out), but in the test mode all graphics are clear, but are
>drawn twice as slow (display flickers)
>Also, when in the audio test mode, the four tones are played twice too
>slow. It
>does not indicate an ROM/RAM error.
>
>I have checked the clock circuitry, which is generating all clocking OK. I
>have
>swapped the Mathbox with a known good one, and this does not help either.
>
>Has anyone a clue how this is possible?
>
>By the way, I am planning to make a complete doc on all waveforms in the
>AVG, so
>others can use it to troubleshoot a non-working one. Do you think this
>could be
>useful or should I save the effort? And, if not, is there somebody who is
>willing host it on his website?
>
>Cya !

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Received on Tue Nov 16 10:23:28 1999