Vectorlist Archives: RE: Asteroids graphics in one corner

From: Bill <sociableone_at_gmail.com>
Date: Tue Nov 24 2009 - 15:25:24 EST

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/
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.709 / Virus Database: 270.14.80/2523 - Release Date: 11/24/09
01:46:00

This archive was generated by hypermail 2.1.8 : Tue Nov 24 2009 - 20:50:01 EST