FCEUX
Open SourceFCEUX is a powerful open source emulator for the Nintendo Entertainment System (NES), Family Computer Disk System (FDS), and other related platforms. It provides a highly accurate emulation experience coupled with advanced tools for debugging, ROM hacking, and creating tool-assisted speedruns (TAS).
Key Features
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Highly accurate NES and FDS emulation.
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Extensive debugging tools for developers and hackers.
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Comprehensive features for Tool-Assisted Speedruns (TAS).