Re: Tempest Tech?? (Using the Z input on scope with Tempest)

Matt,

Scott's suggestion is OK, but there's a little more the to story. If you
use only one of the RGB signals as your Z input, you will only see vectors
that use the corresponding color gun to greate the vector. That is, if you
hook up only your B gun and Tempest draws a magenta vector, you'll see it
because the B and R guns are used to create magenta. But if Tempest draws a
green vector you'll miss it because your scope is blanking on everything
except B gun activity.

In order to see all of the vectors, you must OR all three signals together.
If you scope needs an inverted input on Z, remember to invert the output.
That is, use a 3 input NOR gate or logically equivalent circuit.

Joel-

>Matt,
> Use any one of the three RGB signals as the z input to a scope. Tempest
>has a mono Z out on Q10(i think) Q10 combines the three RGB signals into
>one mono signal, perfect for an o-scope.
>
>-Scott
>
>PS please re-post this to the VL if it doesn't show-up. My VL posts don't
>bounce, but they never appear on the VL.
>
>At 04:38 PM 12/6/99 -0800, Matt Rossiter - Verio Southern California wrote:
>>You can also hook the board up to an oscilloscope if it has an XY mode.
>>This is how I test all my vector boards from home.
>>
>>Of course, this brings up another question I have. I hope I'm not asking
>>too many questions. How does one hook up the Z or blanking circuit to the
>>oscilloscope? I know with black and white vector games there's a Z
>>hookup, but I can't see any for the color vector games but I do see X and
>>Y Inverts. Could someone explain this to me?
>>
>>
>>Matt
>
>--
>Scott Swazey QUALCOMM Incorporated Work: (858) 657-2419
>mailto:sswazey@qualcomm.com V-213G Pager:(858) 683-5210
>
>
Received on Tue Dec 7 08:39:56 1999