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If I remember correctly, the ready plug had a 3 or 4 pin jack that was an option. It gave you a place to plug in the optional 4 input antenna switch, or the stereo adapter, on the models that didnt have stereo installed (I haven't seen one of those for almost 20 years!) I think it carried ground, data and power (+5?). I guess tomorow I'll have to dig out my old zenith manuals and look up the pinout. I have a customer who still uses the antenna switch with her 1985 "CUBE" set
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