President progress

This shows screenshots of milestones in developing the President video game engine for NES:

August 2009
By now I have
 * Gamepad reading code (same as Concentration Room)
 * Trivial palette and tileset loader
 * Metatile engine with attributes
 * Markov decoder
 * Status bar rendered with sprite 0 scroll split (incidentally, sprite 0 is behind the coin)
 * Locator bar to show position of 16x12 window on 512x12 map
 * Bidirectional map data decoder
 * Repeating clouds
 * Sprites made of a rectangular grid of 8x8 sprite tiles