Re: Battlezone Graphics Problem

He he.. Don't worry about that....;-)

It's on a scope and I've not hooked up the Z blanking... its Just the Raw XY
re-trace and all....... You can clearly see the issues though, with some
graphics toggling size and stuff...and the mountains are messed up !!.

One further point is that in the diagnostics screen, its not drawing the
full display... Its just doing the cross hatch and 'part' of the
alphanumeric character set.... Which I guess does point to a memory or
addressing issue in the vector generator circuit.... This makes it
difficult to see if its communicating with the math box as it doesn't get
round to drawing that part, as its not drawing the full 'display list' or
whatever it is called....

I'm going to have to go poking around it I guess....maybe Friday night ??

Regards, Colin

----- Original Message -----
From: "andre" <livnfree_can@yahoo.com>
To: <vectorlist@vectorlist.org>
Sent: Thursday, May 07, 2009 1:13 AM
Subject: Re: VECTOR: 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 20:26:00 2009