Composite -> scart adapter wanted
Composite -> scart adapter wanted
I have a very useful RGB/SCART(Peritel) -> VGA adapter which I use for most of my old computers. I'd like some way to get the composite output from my nailed-to-a-plank development zeddy board onto my vga monitor through this adapter without having to go through my rf->vga box. The quality is terrible and it occupies too much space, and an extra plug socket.
I have a chroma board which would be perfect but I don't want to nail this to the plank so it's not really feasible to use it in this situation.
So what I need is composite -> scart. There don't seem to be any search terms on fleabay which turn up useful items, everything is scart->hdmi these days.
Has anyone else ever wondered this? I want something tiny and cheap. I don't want to do what everyone else seems to do which is use an old VCR.
Ta.
C
I have a chroma board which would be perfect but I don't want to nail this to the plank so it's not really feasible to use it in this situation.
So what I need is composite -> scart. There don't seem to be any search terms on fleabay which turn up useful items, everything is scart->hdmi these days.
Has anyone else ever wondered this? I want something tiny and cheap. I don't want to do what everyone else seems to do which is use an old VCR.
Ta.
C
Re: Composite -> scart adapter wanted
Just for laughs (and because, well you know - educated guess) I put the composite signal into the G(reen) input on my sony broadcast monitor. Yaay! I get a nice clear picture of an inverted K. I was banking on the fact that the monitor would accept sync-on-green as there is no separate sync input.
My RGB -> VGA adapter has a separate sync so, would it 'simply' be a case of grabbing the nearest LM1881 and feeding the separated sync to the sync input and then the unchanged video signal to the R,G and B channels?
That would be sweet.
C
My RGB -> VGA adapter has a separate sync so, would it 'simply' be a case of grabbing the nearest LM1881 and feeding the separated sync to the sync input and then the unchanged video signal to the R,G and B channels?
That would be sweet.
C
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Re: Composite -> scart adapter wanted
It may be even simplersirmorris wrote:My RGB -> VGA adapter has a separate sync so, would it 'simply' be a case of grabbing the nearest LM1881 and feeding the separated sync to the sync input and then the unchanged video signal to the R,G and B channels?

Most real TV's are happy to decode the sync from a composite video signal on pin 20 of the SCART connector.
If your RGB -> VGA adapter (which type do you have anyway?) does not like having a video signal, yes a LM1881 may help.
Mark
Re: Composite -> scart adapter wanted
This is my cheap ol' converter.
I tried the same trick with the video into the G/Y input but no dice - I saw a clear screen for a fraction of a second on a couple of occasions. I think it can work but I suspect sync issues. It doesn't work nicely with (cough)acornatom(cough) RGB with its 60hz refresh rate - lots of flickering and rolling. I may be able to 'reconfigure' it with a screwdriver but haven't looked.
I'll try the 'signal on every pin' thing tonight
I tried the same trick with the video into the G/Y input but no dice - I saw a clear screen for a fraction of a second on a couple of occasions. I think it can work but I suspect sync issues. It doesn't work nicely with (cough)acornatom(cough) RGB with its 60hz refresh rate - lots of flickering and rolling. I may be able to 'reconfigure' it with a screwdriver but haven't looked.
I'll try the 'signal on every pin' thing tonight

- 1024MAK
- Posts: 3469
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Composite -> scart adapter wanted
Ah, the GBS-8200 are a bit too fussy when it comes to their sync inputs.
The Atari ST community had difficulty getting it to sync to the Atari ST's RGB video output. So feeding a composite video signal into the sync input will not work (at least, not on the version 4 and earlier boards).
Mark
The Atari ST community had difficulty getting it to sync to the Atari ST's RGB video output. So feeding a composite video signal into the sync input will not work (at least, not on the version 4 and earlier boards).
Mark
Re: Composite -> scart adapter wanted
If you don't mind another adapter
http://www.ebay.co.uk/itm/LTS-LTAVB0VA6 ... Sw6BtVSmyK
Is what I use for my zeddy on VGA. You can get them much cheaper than that one if your search!
G
http://www.ebay.co.uk/itm/LTS-LTAVB0VA6 ... Sw6BtVSmyK
Is what I use for my zeddy on VGA. You can get them much cheaper than that one if your search!
G
Re: Composite -> scart adapter wanted
I use this setup to get composite to VGA.
The SCART to HDMI adapter is fully SCART compliant and will detect composite, RGB or Y/C input and was £20 on eBay. The HDMI to VGA adapter was another £5.
-B-
The SCART to HDMI adapter is fully SCART compliant and will detect composite, RGB or Y/C input and was £20 on eBay. The HDMI to VGA adapter was another £5.
-B-
Re: Composite -> scart adapter wanted
Hmm, that looks like an option - thanks!
Re: Composite -> scart adapter wanted
It works with my SONY broadcast monitor when using RGB setting and G input in the same quality as using composite.
I assume that your signal does not support the back porch and result in a dark picture with default brightness/contrast settings.
I complained the missing back porch on the CHROMA interface for ZX81 which forced me to use additional sync input and change to external sync.
I assume that your signal does not support the back porch and result in a dark picture with default brightness/contrast settings.
I complained the missing back porch on the CHROMA interface for ZX81 which forced me to use additional sync input and change to external sync.