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GBS-8220 RGB TO VGA Converter

Posted: Wed Dec 01, 2010 7:55 pm
by vanpeebles
Just a quick report as I'm hoping to make this an article for Quanta. After reading some comments in the Oct/Nov 2010 Quanta magazine about QL's and modern monitors, plus seeing a review on a Spanish retro site: http://www.zonadepruebas.com/modules/sm ... temid=1225

I ordered one of these boards from www.jammaboards.com:

http://www.jammaboards.com/store/cga/eg ... d_291.html

The results can be seen here:

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For some reason the pinout in the QL manual seems flipped or I might have read it wrong, I got the colours and the sync the wrong way. Sync is corrected but need to swop the colours for the final soldering. :mrgreen:

Re: GBS-8220 RGB TO VGA Converter

Posted: Wed Dec 15, 2010 9:21 pm
by vanpeebles
Two screenshots to compare the Cub monitor versus the RGB board.

CUB
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RGB
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Re: GBS-8220 RGB TO VGA Converter

Posted: Wed Dec 15, 2010 11:02 pm
by RWAP
That is looking good actually - although I wonder why no-one has ever tried the simple composite video mod on the QL?

Re: GBS-8220 RGB TO VGA Converter

Posted: Thu Dec 16, 2010 8:29 am
by vanpeebles
I've not heard of it, would that mod support monitor mode on a normal tv or monitor?

Re: GBS-8220 RGB TO VGA Converter

Posted: Thu Dec 16, 2010 8:54 am
by RWAP
See http://womblesretrorepairshack.blogspot ... o-mod.html

I don't see why this won't work on a QL, although you will still not get 521x256 pixels on a TV so far as I can see - it is just an alternative if you have a poor display output on the TV set.

Re: GBS-8220 RGB TO VGA Converter

Posted: Thu Dec 16, 2010 9:04 am
by vanpeebles
Ah that RGB board supports monitor mode on a VGA monitor or tv with a VGA socket.

Re: GBS-8220 RGB TO VGA Converter

Posted: Mon Jan 24, 2011 6:32 pm
by robheaton
My RGB to VGA board just arrived!
Time to set to work....

Re: GBS-8220 RGB TO VGA Converter

Posted: Sat Jan 29, 2011 1:22 pm
by robheaton
Finally got my RGB to VGA Converter hooked up, the RGB cable I used had no V. Sync wire at the QL end.

Not a problem though, and the picture is great!

Nice find vanpeebles!

Re: GBS-8220 RGB TO VGA Converter

Posted: Fri Feb 04, 2011 8:18 pm
by Peter
With my German QL, the picture jumps in vertical direction at unpredictable times. Characters are hardly legible in 512x256, and the single pixels at the border can not be distinguished. Did you have the same results? I used the digital R,G,B,CSYNC inputs (called CGA/EGA).

Re: GBS-8220 RGB TO VGA Converter

Posted: Sat Feb 05, 2011 9:18 am
by vanpeebles
Are you using the pole terminals or connected via the cable that came with it? I've had no problems with mine.