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If they have AV cables, they are somehow plugged into splitters, going into a Receiver, going into my TV.  The oldest system which actually operates well on my plasma TV is the NES, which is the oldest system I have with an AV output.  Every system released around or after the Genesis that I own, is hooked to the HDTV.  The rest, the older ones, are around a 27-inch tube television adjacent to this whole mess.  The Intellivision rests atop that TV, and I discovered that these older systems do not like to be wired through each other where the RF cables are concerned.  They need to be plugged in one at a time.