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NET-NES
What it is
NET-NES is a free Nintendo Entertainment System emulator written in C# for Windows, macOS, and Linux. Downloadable builds cover win-x64, win-x86, osx-x64, osx-arm64, and linux-x64. Launching the executable opens a basic interface with File options for opening a ROM and viewing the manual. Command-line controls can load a ROM, run a CPU JSON test, scale the window, show an FPS counter, and enable debug mode. Mapper 0 is supported, while Mappers 1, 2, and 4 are implemented experimentally. The project reports passing nestest CPU instruction tests and lists tested games that work, while warning that some titles may glitch or freeze. Its PPU uses scanline timing rather than dot-by-dot timing, so it is not cycle accurate. Planned work includes a debugger, Mapper 3, player 2 controller support, and audio. NET-NES uses raylib-cs with Rlimgui-cs and ImGui.NET, is distributed under the MIT License, and accepts issues and pull requests.
For and against
For
- Free MIT-licensed software
- Windows, macOS, and Linux builds
- Basic GUI and command-line controls
- Mapper 0 support
- CPU instruction test coverage
Against
- Some games may glitch or freeze
- Not cycle accurate
- Several mapper implementations experimental
- Audio is planned, not listed as available
The verdict
NET-NES provides a lightweight, openly licensed NES emulator across three desktop platforms. Compatibility and accuracy limitations make it better suited to experimentation than guaranteed game coverage.
Who it suits
It suits retro enthusiasts, Nintendo fans, emulation experts, contributors, and newcomers using Windows, macOS, or Linux. Users should be comfortable with experimental compatibility.
Plans and prices
NET-NES
Free software under MIT License
Read 4 Oct 2026 · github.com
On the record
- Accuracy limitation
- The PPU uses scanline timing rather than dot-by-dot timing, so the emulator is not cycle accurate and some games may be affected.github.com · read 4 Oct 2026
- Compatibility
- The README says it passes nestest CPU instruction tests and lists many tested games as working, while noting some games may show glitches or freeze.github.com · read 4 Oct 2026
- Downloads
- The project lists downloadable builds for win-x64, win-x86, osx-x64, osx-arm64, and linux-x64.github.com · read 4 Oct 2026
- Integration
- The project says it uses raylib-cs, with Rlimgui-cs and ImGui.NET also used for its GUI.github.com · read 4 Oct 2026
- Intended audience
- The maker says the project is freely available to contributors including emulation experts, Nintendo fans, retro enthusiasts, and newcomers.github.com · read 4 Oct 2026
- Interface
- Launching the executable opens a basic GUI with File → Open ROM and Help → Manual.github.com · read 4 Oct 2026
- License
- The software is distributed under the MIT License, which permits use, copying, modification, and distribution subject to the license conditions.github.com · read 4 Oct 2026
- Maker location
- The maker's GitHub profile lists Toronto, Canada.github.com · read 4 Oct 2026
- Mapper support
- Mapper 0 is supported; Mappers 1, 2, and 4 are implemented but described as experimental.github.com · read 4 Oct 2026
- Planned features
- The listed upcoming features include a debugger, Mapper 3, player 2 controller support, and audio.github.com · read 4 Oct 2026
- Purpose
- NET-NES is a Nintendo Entertainment System emulator written in C# and capable of running some NES games.github.com · read 4 Oct 2026
- Support and feedback
- The README directs users to open issues for bugs or feature requests and invites contributions through pull requests.github.com · read 4 Oct 2026
- Terminal options
- The command-line options include loading a ROM, running a CPU JSON test, scaling the window, showing an FPS counter, and enabling debug mode.github.com · read 4 Oct 2026