[Coco] Re: again: CoCo RGB to VGA conversion

[jdaggett at gate.net]

Charlie

One thing I stated at the beginning of this thread. The CM8 is 
basically a color TV set that is pressed into RGB monitor service. 
The GIME chip is a basic functional VDU. It has no accelleration or 
dithering. It is a simple plain jane VDU with some graphic 
capabilities. 

To have made the graphics better would have required a pixel clock 
twice what the GIME ship uses and also would have required the 
COCO 3 to have 70nS ram installed instead of the 150nS ram. All 
back then were major cost adders for a machine that was under 
$400. Back in 1986 512K of 80nS ram in 256Kx1 density was not 
cheap. 


james


On 23 Aug 2004 at 8:29, Charlie wrote:

To:             	coco at maltedmedia.com
From:           	"Charlie" <chazbeenhad at hotmail.com>
Date sent:      	Mon, 23 Aug 2004 08:29:20 -0400
Subject:        	[Coco] Re: again: CoCo RGB to VGA 
conversion
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> Just for fun, I hooked one of my coco machines up to a VGA monitor
> using its composite video out and an AVER media device. The device
> lets you plug composite, S-video and has an RF tuner. It is in no way
> a "high-end" device.
> 
> The coco display looked blocky, but not bad at all. However, the 80
> collum text screen was no more readable than if the coco was plugged
> directly into a TV using the composite output.
> 
> Charlie
> 
> "Torsten Dittel" <Torsten at Dittel.info> wrote in
> message news:4122BAC2.778A31A4 at Dittel.info...
> > I'm still thinking about that task. This is for all you hardware
> > guys out there: Do you think it's possible to build a hardware for
> > CoCo RGB to VGA conversion out of these components:
> >
> > For 3-channel analog RGB -> digital RGB888 ADC:
> >
> > http://www.averlogic.com/password/AL875_Data_Sheets.PDF
> >
> > For digital RGB565 -> analog VGA conversion:
> >
> > http://www.averlogic.com/password/AL250_251_Data_Sheets.PDF
> >
> > Here's a design example:
> >
> > http://www.2k1.co.uk/products/averlogic/www1/AL250/AL875_250.pdf
> >
> > taken from this site which has more info:
> >
> > http://www.2k1.co.uk/products/averlogic/www1/AL250/
> >
> > Any comments welcomed.
> >
> > Torsten
> >
> >
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> >
> 
> 
> 
> 
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