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

[CoCoList for Color Computer Enthusiasts]

And on the subject of RGB...

Can someone explain to me why the GIME color palette had to be different 
to the RGB?

Here in Australia, the PAL CoCo3 derives it's composite video off the 
RGB output of the GIME using a seperate daughter board underneath the 
mainboard.

But I don't understand why the GIME's built-in NTSC composite had to 
have a different palette system.

Couldn't they have derived it from the RGB internally in the GIME so as 
to keep the palette the same?

The only story I heard (if true) is that the GIME originally was 
designed for composite and RGB was added later.

Nick