Atari XE/XL PAL version and RGB output?
Vladimir Tichy
output and it has not rgb signal anywhere inside. It has (F)BAS and sychro
only. There is chroma signal in the computer inside.
I was searching for some schematics of rgb adapter on the Internet but I
have not found any.
Does someone know about some? It is not a problem of Atari computer only.
I want any adapter which can make rgb from (F)BAS, synchro and chroma. All
color TV contain circuit which do it.
My monitor can be set to right frequencies, there is no problem here.
I must remark I have European ( !!! PAL !!! ) Atari computer version.
tnx
S.D.Q.
jack
<vtic...@mbox.troja.mff.cuni.cz> wrote:
>I want to connect a rgb monitor to an Atari 800 XE, but it has not a rgb
>output and it has not rgb signal anywhere inside. It has (F)BAS and sychro
>only. There is chroma signal in the computer inside.
>
>I was searching for some schematics of rgb adapter on the Internet but I
>have not found any.
>
>Does someone know about some? It is not a problem of Atari computer only.
>I want any adapter which can make rgb from (F)BAS, synchro and chroma. All
>color TV contain circuit which do it.
I know this is _not_ the kind of suggestion you were expecting, but...
why don't you simply buy an Atari with monitor output?
You can find an 800XL on ebay for around 10 euros, then you build an
rgb cable in 15 minutes and you're ready to go...
ciao
gianfranco
|<evin
>I know this is _not_ the kind of suggestion you were expecting, but...
>why don't you simply buy an Atari with monitor output?
>
>You can find an 800XL on ebay for around 10 euros, then you build an
>rgb cable in 15 minutes and you're ready to go...
I thought the 800xe had monitor output, isn't it just a 130xe with
64k?
kvn
Shawn Jefferson
>I know this is _not_ the kind of suggestion you were expecting, but...
>why don't you simply buy an Atari with monitor output?
>
>You can find an 800XL on ebay for around 10 euros, then you build an
>rgb cable in 15 minutes and you're ready to go...
There is no Atari 8-bit with RGB out. You got composite video, RF and
Chroma-luma (s-video). Some models were missing the Chroma signal at the
monitor jack, and some models didn't have the monitor jack at all.
---
Shawn Jefferson
(fix reply to for email)
silverdr
>
> There is no Atari 8-bit with RGB out. You got composite video, RF and
> Chroma-luma (s-video). Some models were missing the Chroma signal at the
> monitor jack, and some models didn't have the monitor jack at all.
>
Which models did have complete Chroma/Luma aka Y/C aka S-Video available
on the connector?
Vladimir Tichy
Ya, but how to build an interface for changing chroma/luma to rgb does
nobody know? (I know it is a trivial question for TV developers, but I
need it for an Atari and that is why I ask here).
Remark: I think that all XE/XL models must have a chroma/luma signal at
the GTIA output. If somebody has an Atari without monitor output jack or
there is some signal missing on it, it must be possible to connect the
jack or the signal.
Shawn Jefferson
As far as I know these are the models that have chroma-luma available at
the monitor connector:
800
some late model 800XLs
XE series (some European 65XEs, 130XEs, 800XEs)
Most of the XLs either didn't have chroma connected at the montior jack (an
easy fix with a resistor and length of wire), or didn't have a monitor jack
at all (North American 600XLs). The XEGS didn't have a monitor jack, but
had two RCA jacks for composite video + audio.
kryten_droid
"Vladimir Tichy" <vtic...@mbox.troja.mff.cuni.cz> wrote in message
news:2004070114...@mbox.troja.mff.cuni.cz...
> Ya, but how to build an interface for changing chroma/luma to rgb does
> nobody know? (I know it is a trivial question for TV developers, but I
> need it for an Atari and that is why I ask here).
Every colour TV has such a circuit inside!
The tuner extracts composite video off the RF tuner,
then splits it into luma and chroma (i.e. S-video),
then converts those into RGB to drive the colour guns.
Most decent TVs have S-video input and RGB,
cheaper TVs just have S-video.
I've never seen one with RGB input only, which would be the only situation
for duplicating the circuit.
Don't bother trying to send the RGB to a VGA monitor, these are unlikely to
be able to synchronise to TV frame rates.
> Remark: I think that all XE/XL models must have a chroma/luma signal at
> the GTIA output.
Yes they do. Atari forgot to connect chroma to the monitor socket in many XL
machines and didn't fix it until late versions.
Few monitors or TVs had luma/chroma input at the time, so it wasn't a
disaster.
> If somebody has an Atari without monitor output jack or
> there is some signal missing on it, it must be possible to connect the
> jack or the signal.
Yes, this is well documented on the web.
One wire, two solder joints, done.
I'm sure you asked these questions ages ago, and I said the same answers.
I made a simple cable to connect the Atari 800XL monitor socket to an
s-video socket and two phono sockets.
This drove my TV and hi-fi without problems, and you can improve the piccy
by tweaking the video circuit.
See http://www.howell1964.freeserve.co.uk/Atari/800XL/Atari_800XL_Video.htm
Vladimir Tichy
There exists no adapter between Atari XE/XL and some RGB monitor with
right color displaying.
(Clarence Dyson's interace changes the colors, that's bad!)
I am thinking about building an interace with some integrated circuit. Has
anybody tried it?
LarryWhite
Radio-Electronics magazine (U.S.) published an article in the early '90's with
a schematic to convert *NTSC* composite to RGB. IIRC, someone in csa8 built
one and it "sort of" worked. I have no idea if the person ever finished the
project. You might search the Google Groups to see if there is any useful
info.
Beyond that, it may be possible to convert the video in two steps: 1) Convert
the Atari S-Video to Component Video. 2) Convert the component video to true
RGB. But this is big $$$, especially step 2.
You know what you want, but in this case, it's going to be difficult and/or
expensive.
Larry
kryten_droid
> The conclusion is:
>
> There exists no adapter between Atari XE/XL and some RGB monitor with
> right color displaying.
>
>
Vlad, you said you wanted to use an old monitor so you don't have to pay for
a colour TV with an S-video input.
You've been thinking about your idea for at least two months.
You could have spent that time on a minimum wage job and bought a TV.
Or sold your old PC monitor to get money to help buy the TV.
> I am thinking about building an interface with some integrated circuit.
Has
> anybody tried it?
Surely the fact that you haven't found such a circuit yet ought to suggest
to you that there are few good reasons to make one?
K.