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SkyEmu

SkyEmu is a low level GameBoy, GameBoy Color, Game Boy Advance, and Nintendo DS emulator. Its primary focus is to provide a good user experience through a good mixture of tradeoffs of accuracy, performance, features and usability.

Features

Highly accurate Game Boy Advance emulation
Game Boy and Game Boy Color Emulation
Nintendo DS Emulation (Beta Quality)
High Quality Upscaling Shaders, Color Correction, and Screen Ghosting
Cross Platform: Windows, MacOS, Linux, FreeBSD, iOS, Android, and Web
Game Controller and Rumble Support with configureable keybinds
4x Persistent Save State Slots with screenshot preview
Game fastforward and rewind support (supporting very long rewind times)
Action Replay Cheat Code Engine
Localization in Armenian, Chinese, Danish, Dutch, English, German, Greek, Italian, and Russian
Support for emulating the Real Time Clock and Solar Sensor
CPU, MMIO, and Memory Debuggers
Support for loading official BIOS and Boot ROM dumps
Support for loading roms compressed in .zip archives
REST-like API for asynchronous scripting and other automation

Download / Usage

Native builds can be downloaded at: https://github.com/skylersaleh/SkyEmu/releases

The latest version of the emulator can also be played without installing at the following address as a progressive web app:

https://web.skyemu.app/

On Mobile platforms it is recommended to add this to the home screen and launch from there. This will prevent the web browser from auto deleting save files and will make the app full screen.

Note: Platform BIOS/Firmware files are not required as SkyEmu bundles open source replacement BIOS/stubs. However, it is strongly recommended to dump official BIOS/firmware as the open source replacements lack many of the features of the native firmware/BIOS (such as colorizing GB games and the startup splashes) and are not as accurate.

Discord Server

Default Controls:

WASD: D-Pad
J: A button
K: B button
': Select button
Enter: Start button
U: L shoulder
I: R shoulder

On mobile platforms an onscreen touch screen controller is provided.

Loading save files and BIOSs

On web builds save files and the BIOS can be loaded by dragging them onto the page or loading them using the ROM file picker. The GBA BIOS must be named gba_bios.bin for the emulator to pick it up. Save files must be named the name of the rom file with the extension .sav. So for example if the ROM was MyRomFile.gba the save file must be called MyRomFile.sav.

On native builds the above naming convention still applies, but the save/BIOS files must be instead located in the same folder as the ROM file, instead of being dragged or loaded in the emulator itself.

Native Build Instructions

Native builds are experimental currently but can be built using the following commands:

mkdir build
cd build
cmake .. 
cmake --build .

The output binaries should be in the build/bin folder

Native builds support loading roms through the command line by specifying the path to the ROM as the first argument:

./SkyEmu path/to/rom.gba

Accuracy/Compatibility

SkyEmu has been tested on 100s of ROMs and most common games should be playable with no to minor bugs currently. However, the GBA emulation is significantly more accurate than the GB/GBC emulation.

GBA:

Per Pixel PPU Implementation capable of both scan line and mid scan line effects (SkyEmu and NanoBoyAdvance are the only GBA emulators released to support this)
Passes the AGS Aging Test ROM (SkyEmu is the second SW based GBA emulator to ever pass this)
Can run difficult to emulate GBA games such as the NES Classics Series, Golden Sun and Hello Kitty Miracle Fashion Maker
100% Passes all ArmWrestler Tests
100% Passes all FuzzARM tests
100% Passes arm.gba and thumb.gba
Passes 2020/2020 GBA Suite timing tests when utilizing the official Nintendo GBA BIOS (SkyEmu is one of the few emulators capable of passing this test).
Full instruction pipeline and prefetch emulation

GB:

Passes all of Blargg's CPU instruction tests
Passes DMG and GBC acid2 PPU conformance tests
Passes MBCtest
Dotclk based PPU implementation
Anti-aliased audio synthesis with support for APU changes per sample (supports Pikachu's voice in Pokemon Yellow/Pokemon Pinball)

Birds of a Feather

Pokemon Bot: A discord bot that can connect to SkyEmu to allow your discord users to play GB/GBC/GBA/NDS games.
Panda3DS: Panda themed HLE Nintendo 3DS emulator
NanoBoyAdvance: A Game Boy Advance emulator focusing on hardware research and cycle-accurate emulation
Dust: Nintendo DS emulator for desktop devices and the web
Kaizen: Experimental work-in-progress low-level N64 emulator