Tech: pastel colors in RGB monitor
Tim
> ok, this monitor is identical in everyway to the one I normally use for my
> neo, except whereas my main monitor has two RGB inputs (labelled lin and ttl)
> this one only has the ttl. On my main monitor I use the lin RGB for a
> perfect pic...so what is this ttl stuff? As far as I can tell the three main
> colors are a purple, skyish blue, and a yellow. Is there anyway to get this
> monitor to work with the standard arcade RGB output? Why is it called an RGB
> monitor when it's PBY?
>
Sounds like a digital RGB monitor as opposed to an analog RGB monitor. I've
done some converting of digital RGB monitors to be used as analog RGB
monitors. It's not terribly difficult, but involves soldering. Basically, you
need to find where on the pcb the digital signal is converted to analog and
feed your R, G and B signals in there. Schematics for the monitor would be a
big plus, but not absolutely required.
Warning: Before opening your monitor, make sure you know the dangers.
Discharge, discharge, discharge or die.
Tim
mgr...@artic.edu
Hello,
I'm not too much of a techie person, and I've got a problem with a non arcade
monitor I have....It is a Magnavox RGB 80, and I picked it up at the goodwill
today. I attempted to hook up my Neo geo MVS to it, and got a perfect
picture with pastel colors, ack!
ok, this monitor is identical in everyway to the one I normally use for my
neo, except whereas my main monitor has two RGB inputs (labelled lin and ttl)
this one only has the ttl. On my main monitor I use the lin RGB for a
perfect pic...so what is this ttl stuff? As far as I can tell the three main
colors are a purple, skyish blue, and a yellow. Is there anyway to get this
monitor to work with the standard arcade RGB output? Why is it called an RGB
monitor when it's PBY?
Sorry if this post is too juvenile for most :) I posted it here because I
think I will get the most help here, and also because I am hooking up an
arcade board to it, so it's semi on topic :)
thanks,
Matt
mgr...@artic.edu
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Glenn Mandelkern
In article <6l53nk$g11$1...@nnrp1.dejanews.com>, <mgr...@artic.edu> wrote:
>Hello,
>
>I'm not too much of a techie person, and I've got a problem with a non arcade
>monitor I have....It is a Magnavox RGB 80, and I picked it up at the goodwill
>today. I attempted to hook up my Neo geo MVS to it, and got a perfect
>picture with pastel colors, ack!
>
>ok, this monitor is identical in everyway to the one I normally use for my
>neo, except whereas my main monitor has two RGB inputs (labelled lin and ttl)
>this one only has the ttl. On my main monitor I use the lin RGB for a
>perfect pic...so what is this ttl stuff? As far as I can tell the three main
>colors are a purple, skyish blue, and a yellow. Is there anyway to get this
>monitor to work with the standard arcade RGB output? Why is it called an RGB
>monitor when it's PBY?
>
Actually, not "PBY", but "CMY."
The colors you described as "skyish blue" and "purple" are more commonly
known as "cyan" and "magenta." Put the initials of these colors together
with yellow and you come up with "CMY." Go shopping one day for a
color printer or investigate the field of color illustration and you'll
see the common initials "CMYK." (The K is for blacK.) If you take apart
a color printer or buy replacement color toner, you'll see the drums
or ink cartridges are made of these 4 colors.
The "RGB" approach to color generation is an additive approach.
The "CMYK" approach to color generation is a subtractive approach.
Most probably the game board which used this monitor had some inverter-based
circuitry that generated the right color scheme for viewing. I believe
some Nintendo arcade games used similar monitors, so looking at their
schematics can give you an idea for a small circuit board to build as an
adapter.
--
---------------------------------------------------------------------------
Glenn Mandelkern "Hee, hee, hee, hee!" -- Questor the Elf
gma...@netcom.com
San Jose, CA
Games, GUI's and Entertainment
1997 Computer Games Developers Conference Seminar Host: "OO is so good!"
Career Magazine Author, www.careermag.com: The Candidate is a Human Being
Brendan Keith
Glenn Mandelkern wrote:
>
> In article <6l53nk$g11$1...@nnrp1.dejanews.com>, <mgr...@artic.edu> wrote:
> >Hello,
> >
> >I'm not too much of a techie person, and I've got a problem with a non arcade
> >monitor I have....It is a Magnavox RGB 80, and I picked it up at the goodwill
> >today. I attempted to hook up my Neo geo MVS to it, and got a perfect
> >picture with pastel colors, ack!
> >
> >perfect pic...so what is this ttl stuff? As far as I can tell the three main
> >colors are a purple, skyish blue, and a yellow. Is there anyway to get this
> >monitor to work with the standard arcade RGB output? Why is it called an RGB
> >monitor when it's PBY?
>
> Actually, not "PBY", but "CMY."
>
>
> The "CMYK" approach to color generation is a subtractive approach.
>
I suggest an alternate explanation.
TTL inputs are strictly on/off levels. All or nothing.
That's the difference between them and linear inputs which accept
a range of voltages for varying intensity.
The levels may be inverted, however which gives the incorrect
colours. There aren't really C, Y and M phosphors on the screen.
What you have more or less is an old IBM CGA monitor.
--
Brendan Keith
New Email Address: Brenda...@wilcom.com