GBS-8220 RGB TO VGA Converter

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vanpeebles
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GBS-8220 RGB TO VGA Converter

Postby vanpeebles » Wed Dec 01, 2010 7:55 pm

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:

Image
Image
Image
Image

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:


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vanpeebles
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Re: GBS-8220 RGB TO VGA Converter

Postby vanpeebles » Wed Dec 15, 2010 9:21 pm

Two screenshots to compare the Cub monitor versus the RGB board.

CUB
Image

RGB
Image


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Re: GBS-8220 RGB TO VGA Converter

Postby RWAP » Wed Dec 15, 2010 11:02 pm

That is looking good actually - although I wonder why no-one has ever tried the simple composite video mod on the QL?


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vanpeebles
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Re: GBS-8220 RGB TO VGA Converter

Postby vanpeebles » Thu Dec 16, 2010 8:29 am

I've not heard of it, would that mod support monitor mode on a normal tv or monitor?


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Re: GBS-8220 RGB TO VGA Converter

Postby RWAP » Thu Dec 16, 2010 8:54 am

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.


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vanpeebles
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Re: GBS-8220 RGB TO VGA Converter

Postby vanpeebles » Thu Dec 16, 2010 9:04 am

Ah that RGB board supports monitor mode on a VGA monitor or tv with a VGA socket.


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robheaton
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Re: GBS-8220 RGB TO VGA Converter

Postby robheaton » Mon Jan 24, 2011 6:32 pm

My RGB to VGA board just arrived!
Time to set to work....


Current Retro Hardware :-
ZX80 Clone, ZX81 + Chroma + ZXPand + Zeddynet, Just Speccy 128, Speccy 48K, Spectrum 128 +2, BB Sinclair QL + Trump Card Clone, Aurora + Super GC + QubIDE.
BBC Model B 32k + Datacenter + Z80 Tube, BBC Master 512, BBC Master 128k + Datacenter & 6502 Tube.
Amiga 1200, Commodore 64 x3, Commodore 128, C64 Ultimate, VIC 20, Sega Megadrive, Mega CD & 32X.
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robheaton
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Re: GBS-8220 RGB TO VGA Converter

Postby robheaton » Sat Jan 29, 2011 1:22 pm

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!


Current Retro Hardware :-
ZX80 Clone, ZX81 + Chroma + ZXPand + Zeddynet, Just Speccy 128, Speccy 48K, Spectrum 128 +2, BB Sinclair QL + Trump Card Clone, Aurora + Super GC + QubIDE.
BBC Model B 32k + Datacenter + Z80 Tube, BBC Master 512, BBC Master 128k + Datacenter & 6502 Tube.
Amiga 1200, Commodore 64 x3, Commodore 128, C64 Ultimate, VIC 20, Sega Megadrive, Mega CD & 32X.
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Peter
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Re: GBS-8220 RGB TO VGA Converter

Postby Peter » Fri Feb 04, 2011 8:18 pm

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).


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vanpeebles
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Re: GBS-8220 RGB TO VGA Converter

Postby vanpeebles » Sat Feb 05, 2011 9:18 am

Are you using the pole terminals or connected via the cable that came with it? I've had no problems with mine.



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