Emulation tutorials

These cover some specific emulation topics.

• Blargg's 6502 Emulation Notes covers techniques for efficient 6502 emulation.
• Sprite 0 Hit Detection
• Efficient and accurate CPU and PPU timing without running each one every clock cycle
• Filtering left+right and up+down to avoid problems in some games
• Caching optimization for CHR rendering
• CLI latency discussion
• Discussion about CPU per cycle emulation