hardware colors

[Fran123]

Hello!

Does anyone know the reason for the hardware colours (which are in a different order than the firmware colours), and is 
there any reference to this?

Thank you

[andycadley]

At a guess. The hardware colours are just arranged in the most convenient way for wiring, I'd suspect. The firmware arrangement is meant to keep the colours in order of ascending brightness.

[rpalmer]

The colors are based on the wiring of the RGB signals and resistors. Each signal can be 0, 1/2 or 1 in a 3x3 array or resistors thus 27 colours.
Also the colors are coded in the GA and the simplest method was taken to minimise potential errors.

[McArti0]

look

https://www.cpcwiki.eu/index.php/File:40010-simplified_V03.pdf

page 18 (last)