This is an old post, preserved for reference.
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Following on from the previous Atari 2600 black screen repair, I had been asked to modify it to composite video output. The original design has a UHF modulator which outputs the video and audio on analogue TV channel 36. Modern TV's no longer have analogue tuners, and those that do, don't cope with the signals from old computers and games consoles too well.
The Future Was 8 bit.