Quote from: DJ Omnimaga on January 05, 2015, 05:54:08 AM
Because by only drawing every two row of pixels, it doubles rendering speed. Remember that on a CSE, filling the entire 320x240 screen with just 1 single color takes approximately 0.25 seconds, meaning 4 images/seconds. My game runs at 20 FPS on the 6 MHz 83+.
Plus we have to take both rendering and game code speed into account anyway (for example, if this game was 288x192 with no scanlines and ran at 15 MHz on a color model, it would probably run at 8-10 FPS)
So do you just write differences to screen or the whole image?