VGAX library only allows 4 colors, library or hardware limitation? I'm working with VGA DSUB-15 output, however VGAX only allows for 4 colors. I'm using an Arduino Nano that uses an 8-bit atmel chip, and I've seen many 8-bit computers of which have a bit more than 4 colors.
It's a memory limitation. The ATmega328 has 2 KB of RAM, and a 120x60 framebuffer at two bits per pixel (four colors) uses 1.8 KB. There's no room for more.