Vectorlist Archives: RE: Asteroids graphics in one corner

From: Dan Todd <dantoddac_at_comcast.net>
Date: Tue Nov 24 2009 - 20:25:11 EST

AD561s. On the scope the image of the game is smaller than it should be just
like on the monitor. You can
See the ship the asteroids and space ship. There are some stray vectors
floating around and the most notable
Thing other than the picture being small is the the push to start is at the
bottom and the copyright is not
Where it is supposed to be also. The board will not go into self test but
plays with messed up vectors.
Also when plugged into Ast Dlx cab there is no video. Just like the board
below.
Are the newer G05s more sensitive to some things than the older 801?

Along a similar topic I just repaired one board that works fine on the scope
and on a G05-801 monitor but
When plugged into my Ast Dlx cab there is no display but plays blind. Any
idea? Monitor in Ast Dlx is newer
Style G05. Other Ast boards work fine in this Ast Dlx cab.

Dan

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Bill
Sent: Tuesday, November 24, 2009 3:25 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Asteroids graphics in one corner

Does this board have AD561s or DAC6012s? If you look at Xout and Yout on an
oscilloscope in test mode, where is the horizontal axis for the waveforms?
They should be symmetrical around the 0V horizontal X axis.

Bill

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Andrew Welburn
Sent: Tuesday, November 24, 2009 1:20 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Asteroids graphics in one corner

can you take a photo of it as it plays on a regular monitor, your first
description is now different from this one...

I'd say this was a 0v-reference problem, several suspects for it, but a
photo would really help.

Andrew Welburn
www.andys-arcade.com
----- Original Message -----
From: "Dan Todd" <dantoddac@comcast.net>
To: <vectorlist@vectorlist.org>
Sent: Tuesday, November 24, 2009 7:02 PM
Subject: RE: VECTOR: Asteroids graphics in one corner

Definitely not the monitor. I've been trying to repair a few Asteroids
boards and got lucky with 2 so far
Just having bad DACs, 4016s or 081 082 chips. This one I figured was a
counter problem or something because
The whole picture is there it is just tiny and in the lower right portion of
the screen. The last board I had
With a counter problem I had to replace 12 chips trying to figure out which
one was bad. :(

Dan

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Christopher X.
Candreva
Sent: Tuesday, November 24, 2009 12:03 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Asteroids graphics in one corner

On Mon, 23 Nov 2009, Dan Todd wrote:

> I have an asteroids board where all the graphics are showing up in the
lower
> right portion of the screen. The graphics are not all perfect but
>
> everything is recognizable. Any idea where to start looking? I?m going to
> replace the 4016?s I?m just waiting on sockets to come in.

My first thought is power supply, because it is on both axis. If you lost
say the negative supply you might end up with only one quadrant. Offhand I
don't remember if that would be positive or negative.

==========================================================
Chris Candreva -- chris@westnet.com -- (914) 948-3162
WestNet Internet Services of Westchester
http://www.westnet.com/
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