[sdiy-interim] first commercial video module?

[Paul Perry]

Back in the Good Old Days, one converted a TV to a crap
oscilloscope thusly:

Take a line out from the horizonal scan.
Take a line out from the vertical scan.

Now do a bit of analog comparator work, generating a
signal that is on only when the horiz voltage is equal to X
AND the vertical is equal to Y.
And use that output to modulate the beam.

Well, at least it's as analog as hell........

paul perry Melbourne Australia

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