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It is definitely possible to hook an analog RGB signal to a digital TTL monitor and get full color picture. You just have to modify the TTL monitor. It's not that hard, I've done it before. All you need to do is trace the inputs from the back of the set. They should lead into a logic chip of some sort, I forget what chip was used in the monitors I have hacked, but it's a 74 series. Basically, this chip is a buffer or gate between the signal input and the video amplifiers. Cut some tracks and jumper around it, and feed the signal into the video amp - and viola! Analog color picture. I've got an IBM CGA monitor at home that I hacked like this to work on a Commodore Amiga. It works great!
-Ian
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