# Nemulator

> Nemulator is an NES and Sega Master System emulator by James Slepicka, with cycle-accurate timing and support for most NES mappers and unofficial opcodes.

Web page: https://emulationking.com/nintendo/nes/emulator/nemulator/
Page updated: 2026-10-08

- Developer: James Slepicka
- Source code: https://github.com/jslepicka/nemulator
- Supported systems: NES, Sega Master System
- Runs on: Windows

Nemulator is an emulator for the NES and the Sega Master System, developed by James Slepicka. It began as an NES emulator and now reaches a high level of compatibility on both systems.

Its NES emulation is mature, with support for the vast majority of the console's many mappers, unofficial and undocumented CPU opcodes and cycle-accurate timing, which lets it run almost every NES game without problems.

Sega Master System support was added in version 4.0. It is newer than the NES emulation but already works well, making Nemulator worth trying for both systems.

## Latest builds

Download these from the web page: https://emulationking.com/nintendo/nes/emulator/nemulator/#download

- for Windows: 6.1 (2026-10-08)