Color XY on a Oscilloscope

You've got the right idea. Use a diode for each color (wired-OR),
but put in a series resistor also (4.7K?), and connect this to the Z
input of the scope. Works just fine.

Steve
"joe2101" <joeg2101.RemoveThis@hotmail.com> wrote in message
news:1145961312.329206.279460@y43g2000cwc.googlegroups.com...
>I am trying to find some information on hooking up all RGB XY signals
> from a color XY game like Star Wars or Black Widow onto a oscilloscope.
> I know the procedure is simple with a B&W XY(asteroids) but how would I
> go about joining the RGB signals to the scope. From what I am thinking
> 3 1N4001 would do trick but i could be wrong.
> Please Help.....
>
 >> Stay informed about: Color XY on a Oscilloscope 

In article <8OOdnQ2fbpXYtdPZnZ2dnUVZ_tOdnZ2d.TakeThisOut@comcast.com>,
gamefixer.TakeThisOut@gmail.com says...
> You only need to provide the scope with "X" and "Y" to produce an image. I
> think some scopes have "Z" inputs too but I've never seen one with color
> inputs.
>

I think that's what he means. Somehow ORing the colors together and
connecting them to the Z input. I would just run all 3 colors to the
same input through, say, a 1K resistor on each color and see how it
looks.

Jim
 >> Stay informed about: Color XY on a Oscilloscope 

I've worked on color X/Y motherboards with an X/Y 'scope on the bench, and
using the board's X and Y video outputs and ignoring the color outputs will
still let you see all the objects on the 'scope screen just fine. In fact,
chances are you won't even notice the interconnecting vectors that are
normally not visible, as they'll be somewhat fainter than the things you
really want to look at. This is because the average 'scope screen isn't
large enough to see huge detail, as you would on a full-size vector monitor.
 >> Stay informed about: Color XY on a Oscilloscope 

I know it can be done, and very easily.

A friend fixed my Tempest board a few years back, and hooked it up to
a scope. After the repair, he determined that the board was repaired
and my monitor still had issues. A Get Well kit took care of that.
He also insisted that a gameboard needs to be tested with a scope
before testing it with a monitor or it could damage the monitor.

On 25 Apr 2006 03:35:12 -0700, "joe2101" <joeg2101.TakeThisOut@hotmail.com> wrote:

>I am trying to find some information on hooking up all RGB XY signals
>from a color XY game like Star Wars or Black Widow onto a oscilloscope.
>I know the procedure is simple with a B&W XY(asteroids) but how would I
>go about joining the RGB signals to the scope. From what I am thinking
>3 1N4001 would do trick but i could be wrong.
>Please Help.....
 >> Stay informed about: Color XY on a Oscilloscope 

Thanks so much for all the help guys. You have been very helpful.
 >> Stay informed about: Color XY on a Oscilloscope 

> He also insisted that a gameboard needs to be tested with a scope
> before testing it with a monitor or it could damage the monitor.

That is EXCELLENT advice! A bad op-amp output could cause the electron beam
to "slam" out of bounds on the monitor and possibly damage a channel in the
deflection board.
 >> Stay informed about: Color XY on a Oscilloscope