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It looks like the one in Radio Electronics counts lines, and switches a newly-generated vertical interval in place of the macrovisioned-one. So, the actual program material you see is unaltered, not digitized and processed. All the information needed to build your own seems to be in the article, probably including the artwork for the circuitboard. You can mail-order boards made on a one-off basis, and populate it yourself if the parts are still available.
It's quite likely that the $50 version does things the same way...
Chip
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