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jemu
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Multi-system emulator written in Java
Download README (.md)
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<p align="center"> <img src="assets/logo.png" alt="jemu logo" width="200"/> </p> # jemu Multi-system emulator written in Java.   [](https://github.com/ArkoSammy12/jemu/actions/workflows/build.yml) ## Supported systems | System | CLI identifier | Status | |-------------------------------------|-----------------|-------------| | COSMAC VIP | `cosmac-vip` | โ Supported | | RCA Studio II | `rca-studioii` | โ Supported | | VIP CHIP-8 | `vip-chip8` | โ Supported | | VIP CHIP-8X | `vip-chip8x` | โ Supported | | Game Boy (DMG) | `gameboy` | โ Supported | | Game Boy Color (CGB) | `gameboy-color` | โ Supported | | Nintendo Entertainment System | `nes` | โ Supported | | Commodore 64 | โ | ๐ Planned | | Apple II | โ | ๐ Planned | | Atari 2600 | โ | ๐ Planned | | Sega Master System | โ | ๐ Planned | | ZX Spectrum | โ | ๐ Planned | | Sega Genesis | โ | ๐ Planned | | Super Nintendo Entertainment System | โ | ๐ Planned | ## Keybindings ### COSMAC VIP / VIP CHIP-8 / VIP CHIP-8X | CHIP-8 key | Keyboard key | |------------|--------------| | `1 2 3 C` | `1 2 3 4` | | `4 5 6 D` | `Q W E R` | | `7 8 9 E` | `A S D F` | | `A 0 B F` | `Z X C V` | ## RCA Studio II | Keypad A | Keyboard key | |----------|--------------| | `1 2 3` | `1 2 3` | | `4 5 6` | `Q W E` | | `7 8 9` | `A S D` | | `- 0 -` | `- X -` | | Keypad B | Numpad key | Keyboard key | |----------|------------|--------------| | `1 2 3` | `7 8 9` | `7 8 9` | | `4 5 6` | `4 5 6` | `U I O` | | `7 8 9` | `1 2 3` | `J K L` | | `- 0 -` | `- 0 -` | `- , -` | ### Game Boy / Game Boy Color / Nintendo Entertainment System | Action | Key | |-------------|-------------| | D-Pad Up | `W` | | D-Pad Down | `S` | | D-Pad Left | `A` | | D-Pad Right | `D` | | A | `J` | | B | `K` | | Start | `Enter` | | Select | `Backspace` | ## Command-line usage If you launch **jemu** from the CLI, you can optionally pass arguments. Usage: ``` jemu [-hV] -r=<romPath> [-s=<system>] ``` | Argument | Description | Default | |-----------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------| | `-r, --rom <path>` | Path to the ROM file. | โ | | `-s, --system <identifier>` | Launch with the specified system selected, or omit to use the saved setting or system detected from ROM file extension, if specified. See [supported systems](#supported-systems) for valid identifiers. | โ | | `-h, --help` | Show the help message and exit. | โ | | `-V, --version` | Print version information and exit. | โ | On startup **jemu** will attempt to perform a power-cycle with the provided, detected, or saved system and specified ROM file, if any. ## Dev Builds The repository has a Github Actions workflow that runs on every push to the `dev` branch and contains native app image artifacts for Windows, MacOS and Linux, which will stay available for 90 days afterwards: https://github.com/ArkoSammy12/jemu/actions/workflows/dev-build.yml These builds are not well tested and may have bugs. ## Building A Java Development Kit targeting Java 25 or later is required to build this project. This repository contains git submodules. When cloning, use the `--recurse-submodules` flag to ensure they are all downloaded correctly. Once cloned, run the following from the top-level directory: **Windows:** ``` .\mvnw clean package ``` **macOS/Linux:** ``` ./mvnw clean package ``` An executable `.jar` file will be generated at `target/jemu-x.y.z.jar`. To skip the automated unit tests, append `-DskipTests` to the build command. ## License This project is licensed under the [MIT License](LICENSE). ## Special thanks - [Mathew "theklap" Sutton](https://github.com/theklap): Significant accuracy improvements to the NES core. - [dtabacaru](https://github.com/dtabacaru/): Providing audio filtering logic to system's audio processing units. - [Shawn (L. Spiro) Wilcoxen](https://github.com/L-Spiro): Provide accurate audio filtering classes useful for quality NES APU output, and the amazing [Ricoh 2A03 instruction reference](https://github.com/L-Spiro/BeesNES/tree/main/Research/Instructions). - [Andrew "ajoneil" O'Neil](https://github.com/ajoneil): Significant accuracy improvements to the DMG/CGB cores.
