Originally Posted by Foebane
What I've always wondered about is if the halved brightnesses were tied into the 4096 colours of the first 32, or unique accurate shades in their own right. What I mean is, say if a colour register with R01 G02 B03 is used in an image, would the EHB equivalent be R0.5, G01 and B1.5 or would it be the closest colours to be compatible with the 16 levels of RGB that this chipset could produce?
The video DAC inputs only have four bits per gun, so there are no extra colours in the cracks between the 16 levels that are normally available. Instead the levels are simply shifted one bit to the right, truncating the lowest bit, so R01 G02 B03 would become R00 G01 B01.