Thanks for looking at my BattleZone. The same problems show up on a scope,
so I know it's the game board.  With my scope on 5v/div, the self-text box
extends about +/- 8.5 volts. Switching to game mode, the gun site is
centered, the mountains go to +9 v and down to -14 v. The B&W vector FAQ
calls the X limit +/- 10v, so this sounds very wrong.<P>

I've also made  <A HREF="BZone.wmv">a movie of the screen</A>, it's about 
3.5 meg in Windows media format.<P>


First, the test pattern. See how it is fairly well centered ?<P>
<img src="TestPattern.jpg"><P>

Now a game screen. It's ok on the right, but the left side goes to the edge.
As we'll see later, it's drawing on the side of the monitor.<p>
<img src="BZ1.jpg"><P>

Close-up of the OK side (not too useful)<P>
<img src="BZ2.jpg"><P>

Close-up of the bad side<P>
<img src="BZ3.jpg"><P>

** Update -- the following behavior is in fact normal. I just confirmed that
in MAME. Apparently the background is put up in 'tiles', that are normally
clipped to the left edge of the screen. Perhaps the failure is in the
clipping ?<br>
Sometimes, parts of the mountain disappear to the edge . . . .<P>
<img src="BZ4.jpg"><P>

 . . . and reappear a few seconds later.<P>
<img src="BZ5.jpg"><P>

Here you can see it drawing on the side of the monitor<P>
<img src="BZ6.jpg"><P>

The other side again<P>
<img src="BZ7.jpg"><P>