Home Page Forums MAME MAME 8bit Apples - Apple I, II, /// and the 16 bit GS

So the fingerprint g+ is supposed to support regular hi-res:



which looks fine.

It's also supposed to support double hi-res and lo-res, however color 15 white prints as black for some reason.


(doing some experiments changing the cf4b table while it's printing)

There's a table at cf4b that seems to control the printed colors. There's a 2 color dither, offset 0-15 low nibble is color a and 16-31 low nibble is color b.
It's actually quite clever, bit 3 is black, bit 2 is magenta, bit 1 is cyan, bit 0 is yellow.


So if I take entries 15 and 31 for color 15 = white



and change them from 8F 8F to 0 and 0



then the print looks normal:





It looks even better if I do some color correction in gimp to more closely match the screen colors: