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PostPosted: Wed Nov 28, 2018 11:07 am 
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Hello,

There is some thoughts on the real pinout of cassette vision CPU ? I doubt that pin 15 is the composite video signal. When I plug on a TV there is no image. Just a garbled screen.


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PostPosted: Wed Nov 28, 2018 1:20 pm 
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Earlier in this thread is the research I did two years ago: viewtopic.php?p=176030#p176030

You probably need an amplifier of some sort to connect the VIDEO pin to a TV; it probably can't directly drive a 75Ω input. The original Cassette Vision used a big pile of transistors and a 4050 hex inverter IC.


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PostPosted: Fri Nov 30, 2018 12:50 pm 
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Thanks, I already read this topic but pin 15 seem to be luminance not directly composite video.

The purpose is to add composite video to a Cassette Vision jr. who only has RF out.


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PostPosted: Fri Nov 30, 2018 12:57 pm 
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Then you'll have to mix luma and chroma. This isn't exactly hard, but you may wish to reverse-engineer what the original mainboard is doing, and find where they're combined, instead of rebuilding it from scratch.

Alternatively, a TV with an S-video input...


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