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From: Tony Duell <ard at p850ug1.demon.co.uk>
Yes it was though I think the Rainbow used the Z80 as
an IOT processor.?
The video was CGA level
No it was not!. It was CGA (US TV, RS170) scan rates, but it was
_analogue_ RGB, with sung-on-green. It was not TTL levels like CGA.
C: Also not a huge big deal to convert rgb + v + h into composite/rs-170. There used to be
chips that did just that, but I'm not sure if they're still being manufactured.
The problem with the Rainbow might be the relatively high dot clock (800 pixels
horizontal). I'm thinking you'd lose a lot of detail converting to rs-170.
?Anyone know of a chip/circuit that'll separate composite into r, g, b, combined
sync?
not VGA.? Doing VGA video makes finding compatible
monitors easier (CGA
(9pin)went the way of
the dodo).? That does not require you to do VGA level video.
Actually, they are not hard to get in the UK, provided you don't mind
having to spearate the sunc from the green signal. Most TVs -- even
modern ones -- have at least one SCART socket with analogue RGB inpots,
and most TVs over here can hadnle US scan rates.
-tony
C: A scan doubler would be the best thing for a bow w/o a color monitor. Double the
vertical sync. I mean to start working on something like that. It turns out that you would
need to store the signal before spitting it back out in half the time. When this stuff
started to take shape in my head, Tony came along and reinforced that.