Barry Nelson
I developed this modified composite video output circuit for my Tandy Color Computer 1. It seems to produce good stable video. The connections to U12 (or U6) are relics from the original schematic that this was based on. Now the only connections to U12 (U6) are for +5V power and ground. In the original schematic there was another connection to U12 (U6) on pin 12 to get a video signal, but I found that getting the signal from that pin caused several issues, one was that the colors on a PMODE 4 graphics screen came out wrong, another was that it interfered with and distorted the original RF output. So I moved the point where the circuit gets it video signal from to PIN 1 of the RF modulator instead, which only left the +5V and ground connections attached to U12 (U6). You could really use any convenient source of +5V and ground, it does not have to be the pins I used on U12 (U6).
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COCO 1 Composite Video Output
Add a composite video output to a Tandy Color Computer 1
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slandon110
greg.ewing
Alexander Izmailov
Jacques Gagnon
Help! I built this circuit and it works fine in the text screen, but when I switch to gfx, my blues are a deep kelly green and reds are represented as hot pink. I suspect incorrect resistor value at color video out but don't know how to resolve. Can attach photos when I'm approved. Thanks for any help.