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I don't quite understand all your connection schemes above, but from what I can see, the switchbox is an external device, right? Now, I suspect it does some "looping" because I see the 'fade to black' thing when a loop in the equipment is made, i.e. two VCRs have connected both inputs to outputs and vice versa or, on a modern computer, TVOut->VCR->Capture card of the same computer (and VCR tuned to see the output of the TVOut card).
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All those connections work with normal signals, but I was not going to even think about putting the ZX-81 anywhere near that maze. lol.
All the ZX-81 tests were done with equipment disconnected from the "maze" so the test would not be influenced by the loops you mention.
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The successsor to ZX81 (a.k.a. ZX Spectrum or, I believe, Timex) had a built in RF modulator (wee, colour!), but also a composite signal could be pulled out of the edge-connector (just soldering 2 wires), and I (vaguely) remember recording it to VCR and/or displaying it on a pretty demanding/tight composite monitor, so I guess that signal was all right. But I highly doubt the same could be hacked on the ZX81. My guess would be that you would most likely need some kind of TBC.
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Brings back memories! Looks like the TBC is the only solution for the ZX-81's odd RF signal for any kind of direct usage. I wonder if anyone ever rents PCI cards? Somehow, they would have to do it for love not money.
If nothing else, I will set up a Canon Elura 100 Camcorder on a tripod, point it at the flat screen TV screen, record to a Mini-DV tape in the camera, firewire it into the computer to a file, and call it a day.
I have no shame.