17 May
2016
17 May
'16
10:44 p.m.
"moroless"
Firstly, CGA is RGBI (digital RGB, with R, G, B and I for Intensity. But
there is a small difference in color 6
https://en.wikipedia.org/wiki/Color_Graphics_Adapter (see "Color Pallete")
- Arcade graphics are analog RGB in TV resolution (480i, 15.750KHz
horizontal, 60Hz vertical)
- CGA is **never** analog.
- Lots of old computers use RGBI (digital RGB). From my head: BBC mod. B,
Sinclair Spectrum +2/+3, Commodore 128, Amiga (yes, it outputs digital AND
analog RGB)
- There is no such thing as a CGA board with analog outputs.
2016-05-17 17:05 GMT-03:00 Eric Christopherson <echristopherson at gmail.com>:
On Tue, May 17, 2016 at 2:58 PM, Ian Finder
<ian.finder at gmail.com> wrote:
--
Eric Christopherson
I was under the impression it was the same as
analog RGB, but for shitty
cards that don't USE the analog-ness of the RGB standard, and just have
two
state- 0 directly to _MAX in "analog
value"
Yes. It's TTL level. Since posing my question, I've gotten a tiny bit more
educated:
1. Some sites talk about e.g. arcade graphics as being "analog CGA" -- I
was acquainted with these being called "analog RGB" but never saw
"analog"
and "CGA" together before.
2. There are computers knocking about with actual digital RGB signals, like
the BBC Micro B (IIRC). What I forgot to make explicit in my question was
that I was asking about RGBI (+intensity), which AIUI is the same as CGA.
Now, I'm confused about point 1: did actual PCs with CGA have both digital
(TTL) and analog signaling?
On Tue, May 17, 2016 at 12:55 PM, Paul Koning <paulkoning at comcast.net>
wrote:
>
> > On May 17, 2016, at 3:30 PM, Eric Christopherson <
> echristopherson at gmail.com> wrote:
> >
> > ...
> > Do either the 2001 or 2007 support *digital* RGB/CGA out of the box?
>
> What is "digital RGB"? I know RGB as a trio of analog signals. HDMI
is
digital,
as is DVI; did you mean those?
paul
--
Ian Finder
(206) 395-MIPS
ian.finder at gmail.com