Re: TECH : Asteroids deluxe diagonal text/object problems

-----Original Message-----
From: "Andy Welburn" <warlords@ntlworld.com>
To: <vectorlist@synthcom.com>
Date: Fri, 11 May 2001 00:15:57 +0100
Subject: VECTOR: TECH : Asteroids deluxe diagonal text/object problems

>
> hi all..
>
> I've spent most of this evening trying to get this asteroids deluxe to
> display something, it was playing blind. Rather interesting, i found an
> mc14016 was holding the SHCON signal somehow and killing the +8.2v back to
> only 3v. Replaced it, got +8.2v back. The SHCON signal was still mishapen
> when obsrved on my scope compared to a working board, so i replaced Q11
> which has something to do with it too.. this restored the SHCON signal, i
> got a line about 1 inch wide and only a single line high in the bottom left
> of the monitor... I could see things vaguley moving around.
>
> Determined that the problem must lay earlier in the chain, i replaced a DAC.
> and the X returned, i then replaced the other DAC and the Y returned, except
> i get this:
>
> http://www.thedvdproject.com/warlords/astdlx.jpg
>
> and i'm a bit stumped. Several people have seen this before, but can't place
> their finger on the solution... Any ideas? i'm assuming it is a probem
> before the DAC stage... the letters/graphics step up diagonally to the
> right..
>
> thankyou for any help you can offer :)
>
> Andy Welburn
>
I saw that once after i drank 3 cans of tennants-super!!!!!!
(the americans dont know what that is hehe )

seriously though, have you checked the reference voltages on the DAC's?

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Received on Sun May 13 17:47:50 2001