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Basically, this device I'm referring to is just an A/C powered box that accepts a/v cable inputs and sends the output via coax to your TV that doesn't have A/V jacks on it. I believe the two that I've bought are either Phillips or Magnavox brand. I'll double-check when I get home from work in about an hour.
Scott
"RF Modulator" is the name you're looking for. They're mostly automatic now, but the old ones that allowed us to play on our Ataris had a manual switch on them.