Though, I have to admit the number of colors a DS screen can show is a bit... lame. I think it's like 17 bit.
So, twice that of prizm
Wow, that reminds me of this
Your DS has almost TWICE the number of colors as my calculator
18-bit, actually. So 4 times as much
18 kind of makes sense, that's 6 bits for each of R,G,B