RE: Battlezone Question

I'm such a dork - you are right - there is a circuit that at first look
makes a couple of predefined areas, enabled by two latch lines. When the XY
signals exceed set values, it blanks out the Z..

I totally read that message wrong! I thought he was saying you couldn't see
the debris in the window! Ugh, it was too early for me I guess..

So, yes - the circuit is made of XY comparators C11, D12, B12, area latch
at H10, and a Z-blanking or gate at B7.

Thanks,

Chris Brooks

713-931-0975

  _____

From: COLIN DAVIES [mailto:colin.w.davies@btopenworld.com]
Sent: Thursday, March 12, 2009 6:55 AM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Battlezone Question

There is a window circuit if I recall.... You need to check this out...

The game software tells the vector generator to draw two points (either
corner) to define the window size.

Anything drawn outside of this done with zero intensity.

It draws two windows iirc... One for the Game Screen, and one for the HIgh
Score Section (Which could be the whole screen ?)

Regards, Colin

--- On Thu, 12/3/09, Chris Brooks <armis@pcdochouston.com> wrote:

From: Chris Brooks <armis@pcdochouston.com>
Subject: RE: VECTOR: Battlezone Question
To: vectorlist@vectorlist.org
Date: Thursday, 12 March, 2009, 10:57 AM

This is part of the game programming, and is as designed. There is no
hardware that differentiates between upper screen and lower screen formats
or areas, like there is on say Pac Man. For vectors, its just a list of
drawing points in memory.

So you indeed still have a boardset that works perfectly!

Thanks,

Chris Brooks

  _____

From: Matt Rossiter [mailto:matt@rossiters.com]
Sent: Thursday, March 12, 2009 1:50 AM
To: Vectorlist
Subject: VECTOR: Battlezone Question

I have a boardset that works perfectly except for one strange thing.

Normally in the red area where you see the score and warning messages, you
don't see things like exploding tank parts, missiles dropping out of the
sky, the screen cracks, etc. On this board you can see everything in the
red area.

Although it looks pretty cool, I'm wondering what part of the circuitry
limits the playground area and the score/messages area? It seems like there
should be some "Y" limitation. I notice that the screen gets really bright
in attract mode right before the Battlezone logo scrolls up. Which means to
me the beam is already turned on before the Battlezone logo is visible on
the screen.

Maybe a bad counter?

Matt

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Received on Thu Mar 12 08:54:53 2009