RE: Battle Zone board problems

What is the expected Peak to Peak on the X and Y outs from an Atari vector
game? During my testing I am using my scope to check for signal at the test
points but I am seeing very small (like .2v ptp) signals. Seems a bit low
but I don't know what it should be.

Now if I could just get my Tektronix scope with X / Y mode fixed I could
actually see what the vectors were putting out. My Tenma scope doesn't have
x/y. :(

Thanks,
David

> ----------
> From: David Shoemaker[SMTP:davids@wolfenet.com]
> Reply To: vectorlist@spies.com
> Sent: Tuesday, December 30, 1997 9:06 PM
> To: Vectorlist
> Cc: David Shoemaker
> Subject: Battle Zone board problems
>
> I have two BZ AVG boards each with different problems, I am hoping that
> one of you here can give me some help.  As I have no working BZ set I am
> shooting somewhat in the dark.
>  
> Monitor checked out and working, checked with an Asteroids.
>  
> AVG #1
> No vector output (flat line 0 v on X / Y out) (SK on)
> Watchdog barking
> With WD disabled still nothing.
> Test switch results in nothing
>  
> AVG #2
> No Vectors (Spot killer on)
> Board runs
> Self test results in "Long" tones continuously.  I have waited 15 before
> giving up.
> This board is eating the TL082 at D10 (Y).  I replace it and it appears to
> work ok for a minute or two then the output goes to +15Vdc.  And that is
> the end of that op amp. Inputs appear ok.
> At some point in the past the board was hit pretty hard by something, the
> X op amp had blown (literally).  This has been replaced and appears to be
> ok.
>  
> I have 4 math box boards but at this time can't tell what is what with
> them.
>  
> As an aside as I was doing this mail I hooked up my third AVG board and
> noticed that it had a different ROM revision and very faded the words Red
> Baron on it. That would explain why it was not working quite right.  I
> will have to test it at some other point.
>  
> Thanks,
> David
>
Received on Mon Jan 5 16:52:47 1998