19 Jul
2007
19 Jul
'07
9:06 a.m.
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