Kappamalone / PurpleBoy

A fun WIP gameboy emulator to improve my understanding of low-level computer concepts

PurpleBoy

A Gameboy emulator written in Golang to further my understanding of emulation development in general, and as a fun challenge. It's very much a WIP, but with the exception of sound and some MBC's, most games run fine. Since this was a learning project, the emulator is not cycle-accurate nor fast.

Features

• Passable emulation of most titles
• Supports MBC1, MBC2 and MBC3 ROM mappers as well as Battery Buffered RAM
• Some debug output and logging capabilities are available
• Has controller support

Screenshots

Title	In-game

Debugger

Tests

Blaarg's Test roms

cpu_instrs	cpu_timing

Purpleboy also passes all MBC1+MBC2 test roms from the mooneye-gb test suite.

TODO

• Add SPU
• Add support for more MBC's (namely MBC5)
• CGB support

Resources used

All of the resources below were extremely helpful during development of the emulator

Documentation:

• Pandocs
• Game Boy: Complete Technical Reference
• GBEDG
• SM83 Opcode Decodings

Blogs:

• [ emudev ]
• Coffee-gb

Emulator Logs:

• https://github.com/wheremyfoodat/Gameboy-logs

Other GB Emulator's Which I Referenced:

• https://github.com/wheremyfoodat/Beeg-Boy
• https://github.com/mattrberry/CryBoy

Credits

• wheremyfoodat: An invaluable (and very patient) mentor to me throughout development. Helped me locate and fix numerous pesky bugs.
• The wonderful folks over at the r/emudev discord server :D