Colour clash query

[catmeows]

The problem with a scheme like that is it requires masses of extra logic gates to gain a small amount of colours. The simplicity of the existing scheme is that the colours can be generated quite easily from the bitwise pattern.

Not necessary, french Thomson (if I remember it correctly) translates IRGB using fast PROM, to different pallete, replacing dull white by orange and dull black by 50% gray.

[AndyC]

Not necessary, french Thomson (if I remember it correctly) translates IRGB using fast PROM, to different pallete, replacing dull white by orange and dull black by 50% gray.

That works OK for 16 colours (although if you're going that far in the design it's questionable why you would fix the palette entirely), but when you start introducing lots of extra rules like "If PAPER and INK match then the colour is Sky" or "If the Advanced bit is set then reinterpret the screen bits using an entirely different system" then you have no choice but to add a lot of extra decoding logic inside the ULA itself.

[catmeows]

That works OK for 16 colours (although if you're going that far in the design it's questionable why you would fix the palette entirely), but when you start introducing lots of extra rules like "If PAPER and INK match then the colour is Sky" or "If the Advanced bit is set then reinterpret the screen bits using an entirely different system" then you have no choice but to add a lot of extra decoding logic inside the ULA itself.

Sure, I agree, I just wanted to share interesting fun fact