WIP Game Boy & Game Boy Color Emulator

Installation

Pre-built Binaries:

Check the Releases page and download an already built version of Kevboy.

Our CI workflow currently produces binaries for:

• Windows 64-bit (x86_64-pc-windows-msvc)
• Ubuntu 64-bit (x86_64-unknown-linux-gnu)
• Mac OS x86 (x86_64-apple-darwin)

Manual:

• Clone with git@github.com:xkevio/kevboy.git
• Build the project in release mode with cargo: cargo build --release

Usage

Open a ROM via File > Open ROM.

A boot rom is not provided, the state of the Game Boy after the boot rom finishes is emulated.

Serial (link cable) is emulated in so far that games that rely on it do work, though no emulation of actual linking between two Game Boys is implemented.

Supported Memory Bank Controllers:

• MBC0
• MBC1
• MBC2
• MBC3 (without RTC)
• MBC5

Controls:

Controls may be customized via Options > Controls. For manual editing (not recommended, key order needs to be preserved), settings are stored here:

• Linux: /home/UserName/.local/share/Kevboy
• macOS: /Users/UserName/Library/Application Support/Kevboy
• Windows: C:\Users\UserName\AppData\Roaming\Kevboy

Some keys might not be supported.

For a full list, see: https://docs.rs/egui/latest/egui/enum.Key.html

Keyboard	Game Boy
O	B
P	A
W	Up
A	Left
S	Down
D	Right
Enter	Start
Q	Shift

Passed tests:

CPU tests:

Test	Status
cpu_instrs.gb	✅
mem-timing.gb	✅
instr_timing.gb	✅

PPU tests:

Test	Status
dmg-acid2.gb, cgb-acid2.gb	✅
sprite_priority.gb	✅

Timer tests:

Test	Status
div_write.gb	✅
tim00.gb	✅
tim00_div_trigger.gb	✅
tim01.gb	✅
tim01_div_trigger.gb	✅
tim10.gb	✅
tim10_div_trigger.gb	✅
tim11.gb	✅
tim11_div_trigger.gb	✅
tima_reload.gb	✅
tima_write_reloading.gb	✅
tma_write_reloading.gb	✅

TODO

• Implement fast-forward feature
• Gamepad support
• Implement enabling and disabling individual sound channels
• More automatic saving (mmap)
• Implement the Real Time Clock (RTC) in MBC3