Hi everyone, this is Hans from the Netherlands,
I think I could use some help from your knowledge of video signal, Horizontal and vertical sync signal and mixing these.
What is my problem:
In the attic I found an old ping-pong video game with an RF output. Unfortunately this rf output no longer functions properly so I thought, I modify the output and make it suitable for video output. And I need help with this because my knowledge of video, sync, black burst, luminance etc are unfortunately not enough to get this done.
I explain how the ping-pong circuit works ...
The game is from the 70's so it is quite simple, the whole works with one ic and that is the AY-3-8500. There is a lot to read about this ic on the internet because I am not the only one with this idea, so I have tried some circuits but unfortunately there is nowhere a good description of how to get a clear picture, there is certainly a video picture but very dark, so I think the luminancy should go up? But whether this is possible or not and how to manage that I would like to hear from you.
Attached is a diagram of ic AY-3-8500 in which pin 6, 9, 10 and 24 are the image outputs and pin 16 is the sync output. In the diagram, these are connected to each other via a resistance network, but surely there should be a nicer solution for this?
Anyway, please check the schematics and hopefully someone can help me with a solution.
The complete book with the discription of this ic you can found here ....
http://www.pong-story.com/GIMINI1978.pdf
If you have any questions please let me know.
Thanks in advance for reading.