Re: Battlezone Graphics Problem

looks like your z-blanking is hooped..

--- On Wed, 5/6/09, Colin Davies <colin.w.davies@btopenworld.com> wrote:

> From: Colin Davies <colin.w.davies@btopenworld.com>
> Subject: VECTOR: Battlezone Graphics Problem
> To: vectorlist@vectorlist.org
> Received: Wednesday, May 6, 2009, 7:55 PM
> Hi Guys,
>
> Working on a Battlezone board here... I've repaired the AVG
> ( Bad -ve regulator, At least one Bad Dac, Analogue Switch
> and two opamps - one tlo82 caught fire and was spitting
> sparks out of the side).... A Vector ram died too, half way
> through the repair...  Picture is really nice and
> stable now....
>
> Roms and Rams in the 6502 memory map have been tested on
> the fluke 9010a.......
>
> Its not drawing the Tanks or Objects... and the Main
> Display has some issues... Some of the Text and Radar
> suddenly shrinks or toggles around in different places (Its
> got the scaleing mixed up somehow)....  Mathbox is
> OK....
>
> I'm thinking its only drawing part of the vector display
> list... maybe a bad counter or a 74ls670 ram ? 
> Mountains look bad sometimes too...
>
> Any ideas please ?
>
> Video uploaded to youtube...  http://www.youtube.com/watch?v=R11x4MhQfao
>
> An odd one this... But it always is with me !!
>
> Regards, Colin
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Received on Wed May 6 20:13:35 2009