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This connector is very specific and unique and the signal is meant to go back and forth to and from a VTR or a Umatic deck. I think it really only had one purpose. The cable used has the same large multi-pin EIAJ male connector on both ends and it enables the VTR or Umatic to record TV programs from the TV's tuner and it lets the VTR or Umatic play tapes on the TV. A two-way audio-video cable. It's as simple as that. I've used these EIAJ cables many times and they work flawlessly when the cable is good. It also locks in with a nice snap and doesn't come loose easily.
It's possible there were pro models of VHS or Beta VCRs with that same connector on them in the early days. EIAJ connectors were mostly used in pro setups or AV use in schools and rarely in a home situation and not, that I know of, on a computer.
By 1986 that was pretty old technology, but I've seen many 13" Panasonic monitors from the 1980s with the same EIAJ connector and these pre-date most home computers and were meant to simplify early video recording. A one-connector solution instead of using four RCA cables. And you could use the monitor's tuner and antenna instead of needing one in the recorder. This was also before widespread use of cable TV.
RCA jacks are really no comparison to this connector since they can carry many different kinds of signals. I even have an RCA jack in a Zenith radio-phono that carries 6 VAC to the little dial lamp jewel on the base of the console. This large greenish EIAJ connector is only meant to connect TV monitors to video recorders. Anyone who cut their teeth using those old video machines will say the same thing.
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12-16-2017, 08:55 PM
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