An experiment writing a Game Boy emulator in TypeScript

Try the latest build here: https://atomicjon.github.io/tsemu/

Parcel is used for building, in development simply run:

yarn start

This will start the dev server at http:https://localhost:1234

To build a production build run:

yarn build

• Basic instruction processing
• Basic rendering
• OAM DMA transfers
• Interrupt handling
• Joypad input
• Timer clock
• Divider clock
• Basic Tone Audio channels (1 & 2) - frequency only
• Sprite flags
  • Proper palette implementation
  • Sprite flip
  • Sprite rendering priority
• Sound
  • Channel 1 - Tone & Sweep
  • Channel 2 - Tone
  • Channel 3 - Wave Output
  • Channel 4 - Noise Output
• Configurable input for joypad
• Clock adjustment based on FPS (clock is tied to framerate)
• Handle STOP/HALT
• Cartridge type parsing (0x0147)
• ROM bank switching
• Scanline based rendering
• VRAM DMA transfers

The following are the main reference material used during development:

• Game Boy Development Community: https://gbdev.io/
  • Pan Docs: https://gbdev.io/pandocs/
  • Instructions: https://gbdev.io/gb-opcodes/optables/
• RGBDS Opcode references: https://rgbds.gbdev.io/docs/v0.4.2/gbz80.7
• Gameboy Development Wiki (gbdev.gg8.se): https://gbdev.gg8.se/wiki/articles/Main_Page
• Game Boy CPU Manual: https://realboyemulator.files.wordpress.com/2013/01/gbcpuman.pdf