CRTs, LCDs and image capture [was 1966 Mag: Build NE-2 Neon Bulb Computer - scan available]

John Foust jfoust at threedee.com
Thu Jul 19 11:06:58 CDT 2007


At 10:59 AM 7/18/2007, Ethan Dicks wrote:
>I have had that specific problem with RCA 1861 "Pixie" graphics - I
>can get viewable images on 1970s-era CRTs and TVs with no problem, but
>I could not, for example, get a stable picture with an Apple 5" CRT
>(used with the Apple IIc line), or a DEC VR201 (+12VDC/RS170 mono
>monitor for Rainbow, DECmate, Professional, etc.) nor any sort of
>recently-manufactured TV or LCD.  Depending on the exact output device
>in question, either I see pixels but can't get a frame to properly
>lock, or I don't see anything at all.

Mono video isn't too hard to decipher on a 'scope.  I would guess
there's a half dozen ways to mis-conform, as well as a half-dozen
ways that older TVs did not reject out-of-spec signals.

- John




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