Goals

• Developing a cycle-accurate NES emulator with cross-platform deployment including WebAssembly
• Implemented complete MOS Technology 6502 CPU instruction set with precise timing emulation
• Architecting PPU (Picture Processing Unit) with per-dot rendering for authentic video output

TODO

Here’s how you can represent your list items with emojis for better visual distinction:

• ✅ Implement 6502 CPU (minus APU)
  • ✅ Official opcodes
  • ✅ Unofficial opcodes
  • ✅ Ensure cycle accuracy
• ✅ Create 6502 CPU test runner for single-step tests
• ✅ Implement iNES 1.0 ROM parsing
• ✅ Implement Bus-centric architecture (NES wrapper handles orchestration)
• ✅ Implement interrupt handling
  • ✅ Non-maskable-interrupts
  • ✅ Software-defined interrupts
• ✅ Implement user-input via Joypad 1
• 🔲 Implement cycle-accurate DMA transfer through Bus
• 🔲 Implement PPU
  • 🔲 Background nametable rendering
  • 🔲 8x8 sprite rendering (with horiz/vert flips)
  • 🔲 8x16 sprite rendering
  • 🔲 Detect sprite-overflow
  • 🔲 Sprite collision detection
• ✅ Encapsulate mapper logic behind Cartridge trait
• 🔲 Implement APU

Resources

• 6502 opcode references:
  • Obelisk 6502 Guide
  • 6502.org Opcodes
• Illegal opcodes
• Single-step opcode tests
• iNES file format spec
• snake.nes
• PPU timing:
  • PPU timing chart
  • PPU timing details