On Mar 26, 10:41 am, Dekatron42 <[email protected]> wrote:
> Foundthis webpage when Googling, scroll down a bit to the monoscope
> section - with simple valve circuit diagram of test pattern 
> generator!http://www.aade.com/tubepedia/1collection/tubepedia.htm

Doing a test pattern is easy - as long as you scan at the right line
rate (couple of oscillators, bit of blanking) you get a de-facto valid
video signal - that's why they were so popular for test cards etc. -
no screen burn, no focus issues, no warm-up time (to speak of), low
technical risk etc.

What we are talking about here is selecting glyphs from the grid of a
NON-TESTCARD monoscope, i.e. an alphanumeric one. This is a much more
complex problem.

Nick

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