[quote name=\'mitchgroff\' date=\'Dec 12 2005, 10:50 AM\']Still don't know how that thing worked. I got a couple of the puzzle tapes too that Christmas.
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Gun to my head, I'd have to guess that it had something to do with the blanking interval, the microscopic portions of time when the electron gun in the TV is resetting itself from the lower-right corner of the screen back to the upper left to draw the next field. What, I don't know, but that seems to be the most popular way to transmit non-picture data over a television signal.