NOTES ON USING THE CONVERTER
This converter is intended primarily to provide s-video output on LCD displays that
support that connection, but the converter will work with other displays and also
supplies a composite output as well.
The converter can be used with both LCD and CRT displays, but there are a few things
to be aware of. S-video will not support composite color artifacts as used by most Color
Computer 1/2 games (PMODE 4). These artifact colors are supported over the
composite connection.
Use the long-stemmed push button in the middle of the board to adjust artifact colors.
This is the ‘phase adjust’ button, and only affects the composite output, changing the
encoder clock phase slightly. After some time, it is possible for the phase to slip slightly,
requiring readjustment.
When software asks whether you have a composite or RGB monitor, always reply
‘RGB’, even when using the board’s composite connection. This will give you RGB
colors (or the closest NTSC equivalents) for your picture.
Though the converter does work with older CRT type displays, it’s important to note that
the overscan used on these units are likely to crop the top and bottom of the picture. If
the picture is displayed left of center, it may be possible to compensate for this with
horizontal hold. If your CRT doesn’t have a horizontal hold, adjustment of this setting
may be possible in the display’s service mode. Refer to the service manual for your
particular display for details. LCD displays typically display the entire picture, making
this a non-issue with them.
If you experience issues with minor waving or flickering of the image, adjusting the trim
capacitor in the GIME clock circuit slightly can often clear this up (TC1).
Summary of Contents for RGB2NTSC
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