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Author Topic: RGB to VGA adaptor  (Read 7585 times)

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Offline sperrettTopic starter

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RGB to VGA adaptor
« on: February 27, 2011, 09:01:42 PM »
Hi Guys! I'm new here and signed up having just rescued my old A1200 from a pile of dust in the Attic! :) I used to have a lovely Multiscan monitor that I bought from David Pleasance. Managing Director of Commadore UK. Sadly! It's now dead! So I've been trying to find an alternative. I have a 17" CRT monitor and I was wondering if this would work? What d'you think?
« Last Edit: February 27, 2011, 10:18:26 PM by sperrett »
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Offline SamuraiCrow

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Re: RGB to VGA adaptor
« Reply #1 on: February 27, 2011, 09:10:39 PM »
I think your second link is broken.  But whether or not an RGB to VGA adapter will work well depends on the monitor you're hooking it to.  If you have an ordinary VGA monitor it will require a scan doubler such as the IndivisionAGA which will be coming out with a new batch shortly.  Otherwise you'll be stuck with using the AGA mode promotion which doesn't work well even if it does work.
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Offline drHirudo

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Re: RGB to VGA adaptor
« Reply #2 on: February 27, 2011, 09:21:53 PM »
You can use RGB to SCART convertor and use monitor with use input. I use such LG monitor and the pictures is very good. Much better than from the composite out almost RGB quality.
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Offline sperrettTopic starter

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Re: RGB to VGA adaptor
« Reply #3 on: February 27, 2011, 09:51:05 PM »
The link is to this. It costs £18 I would imagine that's about $25...?

Please wait
Image not available



  • Enlarge





 RGBs EGA CGA YUV 15K to 2 VGA 31K Signal Converter PCB
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Offline XDelusion

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Re: RGB to VGA adaptor
« Reply #4 on: February 27, 2011, 10:01:31 PM »
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Offline sperrettTopic starter

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Re: RGB to VGA adaptor
« Reply #5 on: February 27, 2011, 10:10:02 PM »
Quote from: XDelusion;618296
Here's a couple of options to consider:

http://www.amigamaniac.com/RGB_to_PAL_NTSC_adapter.html


http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=918

The scan doubler is £85. I can't justify spending that amount on my Amiga. As much as I love it!  I might try the option I've posted. If it works! It wont take much to encase it. And at £18, it will be worth it! It says clearly that it converts 15k to (2x) 31k. I'll let you all know if it works!
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Offline ribdevil1

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Re: RGB to VGA adaptor
« Reply #6 on: February 27, 2011, 10:13:28 PM »
In theory, yes, it doubles de RGB 15k from the Amiga to VGA 31k, so any VGA monitor works, but I can't see very well the connectors, I think you need and extra adaptor from the RGB Amiga to the RGB input of the converter.
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Offline XDelusion

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Re: RGB to VGA adaptor
« Reply #7 on: February 27, 2011, 10:16:19 PM »
Quote from: sperrett;618297
The scan doubler is £85. I can't justify spending that amount on my Amiga. As much as I love it!  I might try the option I've posted. If it works! It wont take much to encase it. And at £18, it will be worth it! It says clearly that it converts 15k to (2x) 31k. I'll let you all know if it works!


If that works for you, lemme me know, I'm very curious!
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Earth has a lot of things other folks might want... like the whole planet. And maybe these folks would like a few changes made, like more carbon dioxide in the atmosphere and room for their way of life. - William S. Burroughs
 

Offline sperrettTopic starter

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Re: RGB to VGA adaptor
« Reply #8 on: February 27, 2011, 10:19:14 PM »
Quote from: SamuraiCrow;618278
I think your second link is broken. .

Just fixed it if you wanna look?
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Offline abruzzi

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Re: RGB to VGA adaptor
« Reply #9 on: February 27, 2011, 10:30:03 PM »
I plugged my Amiga 3000 (with the scan doubler disabled) into my Acer LCD monitor (20', $100) and it worked just fine.  Since a lot of new LCD monitors were probably specced in the factory to do double duty as monitors or TVs, many may work.  Mine works fine with HiRes and others, it just doesn't like PAL modes.

Geof
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Offline desantii

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Re: RGB to VGA adaptor
« Reply #10 on: February 27, 2011, 11:43:18 PM »
I bought one of these some weeks ago. Works.. somewhat
 
It does scandouble so you get a nice display with no flicker and high res, but after a while it starts getting funny, like it looses sync and the image is wavy. I am travelling but will post a pic when I get back
 
Quote from: sperrett;618294
The link is to this. It costs £18 I would imagine that's about $25...?

Please wait
Image not available
 
 

  • Enlarge

 

 
RGBs EGA CGA YUV 15K to 2 VGA 31K Signal Converter PCB
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Offline alexh

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Re: RGB to VGA adaptor
« Reply #11 on: February 27, 2011, 11:55:27 PM »
Quote from: desantii;618315
after a while it starts getting funny, like it looses sync and the image is wavy.

Is this an 1.D4 A1200? Perhaps you need to add a capacitor to the circuit recently identified in another post?

http://www.amiga.org/forums/showpost.php?p=611485&postcount=17

http://aminet.net/package/docs/hard/flickfix
« Last Edit: February 28, 2011, 12:03:11 AM by alexh »
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Offline desantii

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Re: RGB to VGA adaptor
« Reply #12 on: February 27, 2011, 11:57:35 PM »
I was trying the adaptor in an A2000 using an origibal 23-9 pin cable to feed the adaptor. First i used a 23-25 adaptor to feed to the 15pin port and it did not owrk.
 
Then I used the 23-9 cable and took the signal from that
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Offline Stedy

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Re: RGB to VGA adaptor
« Reply #13 on: February 28, 2011, 12:09:10 AM »
Sperret, that looks like the Gongbes unit, commonly sold on ebay. Here are the tech specs, sorry about the formatting, the website is down, this is taken from my Onenote book.

GONGBES
8220
The high definition converter GBS-8220 is a professional game& playstation display converter. Supported all games(Amusement. Play statioft Xbox. wii )convert to CRT monitors LCD monitor PDP monitor Auto scan CGA1EGAIYUV signal, VGA outputs, output high resolution signal.
Power
DC5V 2A ±1- 0.5v
P7 or P9
Input
signal
CGA/EGA
14.5-16.5K
23.5-25.5K
30.5-32.5K Auto scan P3 or P11 or PlO
RGBHV  30.5-32.5K  Auto scan PlO or P11
VGA
30.5-32.5K Auto scan PlO or P11
Ypbpr  
480p, 576p,720p, 1080p Auto scan P2
Ycbcr
480i,576i,720i, 1080i Auto scan P2
Output signal
VGA
640*480,800*600
1024*768,1360*768
P4 and P13

User control
Input Switch, Image Zoom, Image Position,
Output Resolution ,R\G\B gain adjust.
Menu Key
R\G\B VR
Dimensions
115*105*20mm

The main issue is that it will not be able to process the RGB video from the Amiga. It accepts YPbPr/YCbCr video but this is a different colourspace (the picture may work but will have incorrect colours).

You will need one of these to colourspace convert:
http://www.jaycar.co.uk/productView.asp?ID=KC5398&keywords=video+converter&form=KEYWORD

Ian
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Offline sperrettTopic starter

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Re: RGB to VGA adaptor
« Reply #14 on: March 07, 2011, 07:51:15 PM »
Interesting. Thanks Ian.
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