RuNES

As we know, there have been a ton of NES emulator implementations in various kinds of languages (mostly C). All of these emulators come with different accuracy and portability. RuNES is an attempt to build a reasonably accurate (cycle-level accurate), light-weight and efficient emulation core library using Rust. Unlike sprocketnes or pinky, RuNES strives to provide with a clean and minimal core library without standard library (i.e., without Box, Rc, Vectors, etc.) that could be compiled and easily ported to embedded environments. Of course, a minimal but usable SDL-based GUI is also provided as a demonstration of use.

Feature

• Core library with minimal use of the Rust core crate, and zero use of std.
• Lightweight and clean code base.
• Support standard 6502 instruction set (unofficial instruction will be considered in the future).
• Load/save the machine state.
• Cycle-level accuracy (in-progress).

Guidelines

• Never use std in the core library.
• At the same time, avoid unsafe as much as possible, but use it at discretion to improve performance: remove unnecessary checks within a very localized context.
• Keep the core library code base minimal.

Build the Example Emulator

GNU/Linux

# for Ubuntu
# install Rust toolchain (https://www.rustup.rs/):
# $ sudo apt install curl gcc
# $ curl https://sh.rustup.rs -sSf | sh
# and add $HOME/.cargo/bin to your $PATH
# install SDL2 by:
# $ sudo apt install libsdl2-dev        # install SDL2 library

git clone https://github.com/Determinant/runes.git
cd runes
cargo build --examples --release        # build the binary
target/release/examples/runes --help    # see the help message

Mac OS X

# install homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
# install Xcode command line tools
xcode-select --install
# install SDL2
brew install sdl2
# rust up
curl https://sh.rustup.rs -sSf | sh
# build RuNES and enjoy
git clone https://github.com/Determinant/runes.git
cargo build --examples --release