Rustboy

Gameboy Emulator Written in Rust

• I am mainly making this to learn more about old architectures and as a fun learning project to get better as Rust. Not neccessarily the most accurate/correct emulation of the GameBoy.

Progress

10/21/21

• Graphics are working with the bootrom sourced from Bootix.
• Running at 60 fps

1/11/21

• Instructions have been "finished", still need to be tested
• I started adding graphics logic
  • Right now it can fetch tiles from memory which I represent as a u16, and creates the background as a vector of u16.
• Remaining Tasks:
  • Actually render the background
  • Overlay the window on top of the background
  • Render the Sprites from OAM
  • Interrupt Logic
  • TESTING

1/10/21

• Most of the main opcodes have been added
• Just the EI/DI and the remaining CB opcodes are left
• Testing to make sure the instructions work as intended remains as well

9/15/20

• instructions.rs contains most of the decoding of the assembly and the corresponding loads/stores
• cpu.rs contains the execution loop of the cpu and the reg files/memory layout
  • Gameboy uses a Fetch/Execute overlap so certain instructions can fetch and execute in parallel across a clock cycle

Sources

https://gbdev.io/pandocs/

https://realboyemulator.files.wordpress.com/2013/01/gbcpuman.pdf

https://gekkio.fi/files/gb-docs/gbctr.pdf

https://stackoverflow.com/questions/57958631/game-boy-half-carry-flag-and-16-bit-instructions-especially-opcode-0xe8