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Originally Posted by RetroHacker
And, don't forget - the optocoupler was powered by the computer. The thing took regular composite video - but was only meant to work with the Model 1 - It used a five pin DIN plug that carried the video signal and 5v to power the optocoupler. I guess there wasn't a convenient source of 5v inside the television...
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To get some +5V internally, all you'd need to do is wrap a few turns of wire around the flyback ferrite core (like the way they got filament power for tube high voltage rectifiers), rectify and filter it and use a voltage regulator IC to get local isolated +5V. I've done this in a few hot chassis TV sets to get baseband video into them.
Also, I found it easy to feed regular composite video along with some +5V into my brother's TRS-80 monitor. Fed it Star Trek video from a VCR playing back a videotaped Star Trek show. Thus "computer geek heaven, Mr Spock using the ship's computer presented on a computer monitor".
