[Coco] Using the Tandy Color Computer 3 with an RGB monitor

CoCoList for Color Computer Enthusiasts coco at maltedmedia.com
Mon May 12 14:20:30 EDT 2014


On 13/05/2014 3:36 AM, CoCoList for Color Computer Enthusiasts wrote:
> This is what I meant in my recent screencast when I said that the
> CoCo3's palette registers are "close" to the video output.  The bits
> from the CoCo3 palette registers seems to essentially be directly
> connected to the YIQ signals used to generate the color composite
> video signal.  Those same bits are also forked off to the RGB video
> outputs to map to the RGB color channels, with no translation for
> either side of the fork.
>
> Some contemporary systems had a chip that could map from RGB to the
> appropriate colors signals for NTSC/PAL/SECAM, but I guess that Tandy
> was too cheap to spring for another chip on the motherboard?
>
> John

Thanks for the explanation John. Here I am thinking they went to the 
effort to create each signal type but was confused why they made each so 
different.

Now I see they simply took the easiest route to achieve things.

Nick



More information about the Coco mailing list