Quote Originally Posted by Jazzmarazz View Post
Tight timer interrupts.
I got some test bars to display predictably over composite video generated with a 16MHz arduino pro mini. Monochrome.
The original design called for a 328PB running at 20MHz with two slave SPI's intercepting the two LCD data pins on the gameboy, however this would mean I need (2*160*144)/8 bytes of RAM for a video buffer, but the chip only has 2kBytes as opposed to the necessary 5,760 Bytes.

So while I test out code on slower microcontrollers, I am shopping around for something along the lines of the dsPIC33EV64GM002 with 8kBytes RAM, multiple SPIs and remappable pin functions as opposed to simple GPIO.