[Coco] Using Roy's vga adapter with other computers
snhirsch at gmail.com
Sun Oct 25 09:13:18 EDT 2009
On Sun, 25 Oct 2009, Bob Devries wrote:
> Isn't the Commodore 128's RGB port a digital one? That is, RGB-I instead of
> Analog RGB?
The C128 is indeed a digital RGBI signal. In order to get the proper
color mapping, you need to build a simple 2-chip adapter that converts to
a quasi-analog signal. Wolfgang Moser (Womo) published a schematic and
PCB layout for just such a device. I built one on perf-board and use it
to connect my C128 to the same Wei-Ya RGB/VGA converter that works so well
with my CoCo.
With a little tweaking of level trim-pots, you can get the entire C128
color pallete to display faithfully.
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