Re: One other G08 Monitor question

Matt Rossiter - Verio Southern California wrote:

> OK - it looks to me like the x or y axis is not offset on the scope - but
> let me ask if I'm setting this up right. Do I connect channel 1 probe
> onto pin 1 (x) of the xy timing board and channel 2 probe onto pin 4 (y)
> of the xy timing board? And then set the oscilliscope onto xy mode? I
> was sort of hoping it was possible to watch my game on the oscilliscope.
> Maybe even play one or two rounds :)
>
> Seriously - learning this will really help me with other xy games I'm
> working on - so thanks for the input.
>

I don't know pinouts, but it sounds like you have the settingsright. When connected
and the scope put into XY mode you
should see the game running PLUS a LOT of extra lines and
probably a VERY bright dot in the center of the scope screen.
What you'll probably want to look at is that test pattern that
originally had you wondering if there was a problem.

All the extra stuff that you see on the scope is blanked on the
monitor by the video signals. You could run one of the video
signals into the Z-axis (brightness) input on the back of the
scope (if it has one), but it isn't worth the trouble.

> Matt
>
> > If you look at the X and Y drives from the game board
> > do they appear to have zero offset? (That's a little tricky
> > to test---feed both into a scope in XY mode and adjust
> > scope gains/centering for a good picture. Then set the
> > scope inputs to ground and make sure the dot is centered.
> > Turn the scope inputs back on and look for the picture to
> > be offset in any direction. If it is, the board can be the
> > problem. If it looks OK the monitor is the problem).
> >
> >
> > Matt Rossiter - Verio Southern California wrote:
> >
> > > Well - I've actually got this thing completely fixed and looking pretty
> > > good. I'm just doing some fine adjustments to it. My question is this....
> > >
> > > On my Space Fury - I put the game into service mode where it will draw you
> > > a rectangle with three colored stripes in the center to adjust centering,
> > > convergence purity, etc. Well, my rectangle looks more like a trapezoid.
> > > My suspicion is - someone at the factory got lazy when adjusting the
> > > deflection yoke and didn't put the wedges in with the exact same preciseness
> > > that I would have if I was doing it. So I guess I might have to pull the
> > > wedges off and do the adjusting myself. I've done this with several other
> > > monitors and it's a big pain.
> > >
> > > Anyway - the question is - could there be anything else that is causing
> > > the picture to pull to the right? It's not so noticeable during game play
> > > except that some of the convergence goes out in the corners (Which bugs me
> > > of course).
> > >
> > > Thanks
> > >
> > > Matt
> >
> >
> >
Received on Thu Dec 17 05:37:15 1998