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Emulators written in JavaScript

A list of emulators written in the JavaScript programming language.

This list started as a compilation of JavaScript emulators posted to Echo JS over the years. If you know about any missing emulators, please consider adding them to the collection: the source for this page is available on GitHub. Thank you in advance.

Lastly, if you are into JavaScript, you might enjoy Echo JS.







Data General



Robotron / VEB Mikroelektronik




  • PSeudo - JavaScript/WebGL/WebAudio browser based PLAYSTATION emulator (aka PSX) (needs boot ROM image, not supplied) (Source)


Multi-system Emulators

  • JSMESS examples - The JavaScript MESS (Multi Emulator Super System) (Source) (Notes)
  • PCE - PC emulators in JavaScript (Atari ST, IBM PC 5150, Macintosh, RC759 Piccoline)
  • RetroArch - JavaScript port of RetroArch (bundles Gambatte (Gameboy), Genesis Plus GX, Handy (Lynx), Snes9x Next, VBA Next (GameBoy Advance), Tyrquake and FinalBurn Alpha)
  • RetroWeb - collection of Javascript emulators and boot media, including Apple-IIe (VisiCalc), Macintosh (System 1.0), Atari 1040ST, Commodore 64, Amiga 500 (Workbench 1.3), IBM PC Model 5150 (PC-DOS, CP/M-86, Cassette Basic), IBM PC XT (DOS, GEM 1.2, VisiCalc, Windows 1.01, 8088 Corruption demo), RC759 Piccoline (Eliza, Bil-simulation, Concurrent CP/M-86), TRS-80.
  • YAKC - Z1013, Z9001, KC85/2 family, Speccy, CPC, Acorn Atom, C64, with integrated debugging UI (source)
  • Tiny Emulators - based on the same chip- and system-emulator source code as YAKC, but as minimal WASM apps without fluff (source)

PC Emulators

Bare CPUs

  • 8008 running SCELBAL by Mark G. Arnold. ("SCELBAL is the only open-source, floating-point, high-level language ever implemented on the 8008")
  • 8080 CPU emulator - Intel 8080 CPU emulator running Space Invaders ROM (Source)
  • Angel - JavaScript RISC-V ISA simulator booting linux in a web-browser (Source)
  • Angular 2 6502 written with TypeScript and Angular 2, by Jeremy Likness
  • ARM-js - An ARM emulator written in JavaScript (Source)
  • ASM80 - Online assembler for 8-bit microprocessors by Martin Malý. Includes emulation of several machines: 8080, Z80, 6502, 6809. (Sources)
  • Basic MIPS functional simulator and Basic MIPS pipelined simulator by Mianzhi Wang (morriswmz). (Source)
  • Easy6502 - JavaScript 6502 tutorial and emulator (Source)
  • EduMIPS64 - educational MIPS64 CPU, ported from Java by Andrea Spadaccini using GWT (see blog here.) (Source)
  • FRISCjs - an 8-register educational RISC from the University of Zagreb, with both assembler and front panel, by Ivan Žužak. Source
  • Imaginary 6502 - 6502 Emulator and Assembler
  • Intel 4004 emulator - by Maciej Szyc. Includes assembler and disassembler.
  • Intel 8080 CPU Emulator - Emulates a minimal Intel 8080 Microcomputer that runs CP/M
  • JavaScript 8080 Emulator - 8080 arcade game emulator in JavaScript
  • Mipsdis - MIPS disassembler that runs in the browser
  • RISC Relay Computer - Relay based computer project with a 16 bit RISC CPU. Emulator includes an assembler and source for a calculator program. By RJH. See website.
  • RISCVEMU - RISC-V emulator boots 64-bit Linux. By Fabrice Bellard.
  • Simple 8-bit Assembler Simulator - Provides a simplified assembler syntax (based on NASM) and is simulating a x86 like CPU (Source)
  • uARM.wasm - ARMv5TE emulator running Linux in browsers (Source)
  • Unicorn.js - The Unicorn emulator framework, now available for JavaScript (Source)
  • Visual ARM1 - JavaScript/WebGL for ARM's first CPU, modelling 25000 transistors at switch level and animating the original chip layout - in 3D. See the blog post
  • Visual 6502 - JavaScript simulator for the 6502 CPU, modelling thousands of transistors at switch level and animating the original chip layout. See also expert mode.
  • Visual 6800 - JavaScript simulator for the Motorola 6800 CPU, modelling thousands of transistors at switch level and animating the original chip layout.
  • Visulator - x86 machine emulator that visualizes how each instruction is processed (Source)
  • YAMD - Yet Another MIPS Debugger (Source)
  • jor1k - OpenRISC OR1K JavaScript emulator running Linux with network support (Source)
  • jslm32 - JavaScript LatticeMico32 emulator running Linux (Source)

Early machines

Calculator emulators

Microcode-level calculators

Workalike calculators


Adventure Game Engines

  • Emscripten ScummVM - Emscripten fork of the ScummVM engine (Source)
  • IFVMS - Infocom/Inform Web interpreter
  • Parchment - Infocom/Inform Web interpreter
  • ZZTJS - ZZT game engine in JavaScript
  • ngPAWS - Professional Adventure Writer (PAW) Web interpreter

See also (lists of JavaScript emulators elsewhere)

Additional Information

This resource collection is maintained by Frederic Cambus.



To the extent possible under law, Frederic Cambus has waived all copyright and related or neighboring rights to this work.