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.

• ElkJS - JavaScript based Acorn Electron emulator (Source)
• Acorn Atom Emulator - by Phil Mainwaring. Type "OLD" for an Easter Egg
• JSBeeb - JavaScript BBC Micro emulator (Source) (Development blog)

• CPCBox - Amstrad CPC emulator in JavaScript
• Roland - An Amstrad CPC emulator written in JavaScript

• Apple 1js - by Will Scullin
• Apple IIjs - An Apple ][ Emulator in JavaScript
• a2 - A fast, WebGL optimized Apple ][+ emulator.
• Apple2JS - A JavaScript emulator for the Apple II
• Yet Another Apple 2+ in JavaScript - by Thomas Skibo

• EstyJS - A pretty fast and functional JavaScript Atari ST emulator (Source)
• Javatari.js - Atari 2600 emulator by Paulo Augusto Peccin. (Example cartridges online) (Source)
• jsA8E - JavaScript version of the A8E Atari 800 XL Emulator

• Commodore LCD emulator - by Gabor Lenart
• Commodore PET - by Thomas Skibo
• JSC64 - Commodore 64 emulator written in JavaScript (Source)
• Kim1 - emulation in JavaScript by Rob Sayers (Source)
• SAE - Scripted Amiga Emulator (Source)
• VIC-20 Emulator - JavaScript VIC-20 emulator
• VICE.js - Versatile Commodore Emulator for JavaScript (Source)

• PDP-1 running the SpaceWar game and the Minskytron demo - by Norbert Landsteiner
• Javascript PDP 11 - PDP-11/70 emulator with simulated front panel and a choice of operating systems. By Paul Nankervis
• PDP-11 Emulator - A JavaScript PDP-11 emulator running UNIX Sixth Edition. By Julius Schmidt
• pdp11-js - PDP-11 emulator with UNIX V6. By Takahiro Aoyagi

• 1964js - JavaScript port of the 1964 N64 emulator for Windows
• CycloaJS - JavaScript NES Emulator (Source)
• GBA.js - Game Boy Advance in the Browser (Source)
• GameBoy Online - JavaScript GameBoy Color emulator (Source)
• IodineGBA - A GameBoy Advance emulator written entirely in JavaScript (Source)
• JS-VBA-M - JavaScript port of VisualBoyAdvance-M, a Game Boy Color / Advance emulator
• JSNES - A JavaScript NES emulator (Source)
• Nezulator - A NES emulator in JavaScript
• XNES - Experimental JavaScript Super Nintendo emulators (Source)
• fam - JavaScript NES emulator (Source)
• jsGB - A GameBoy emulator in JavaScript (Source)
• mupen64plus - A port of the popular Nintendo 64 emulator for the Web (Source)
• n64js - An N64 emulator in JavaScript (Source)

• jsSMS - JavaScript Sega Master System & Game Gear emulator (Source)
• Miracle - Sega Master System emulator (Source)

• Enterprise-128 JavaScript Emulator - by Gábor Lénárt, based on JSSpeccy
• JSSpeccy - A ZX Spectrum emulator in JavaScript (Source)
• JtyOne Online ZX81 Emulator - by Simon Holdsworth
• Qaop/JS - ZX Spectrum emulator
• ZX80 Emulator - JavaScript ZX80 Emulator
• jBacteria - The smallest JavaScript Spectrum emulator

• MC-10 Emulator - Emulator for the TRS-80 MC-10 microcomputer
• TRS-80 Model III Emulator a Javascript emulator for the TRS-80 Model III
• JS Mocha - The HTML5 CoCo 2 Emulator
• jTandy - Another JavaScript TRS-80 emulator

• 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.

• JS/Linux - JavaScript PC emulator
• JsDOSBox - JavaScript PC DOS emulator (Source)
• PCjs - IBM PC Model 5150 emulator
• Virtual x86 - An x86 emulator written in JavaScript (Source)
• jemul8 - An object-oriented JavaScript x86 emulator for Node.js and the Browser (Source)
• jsbochs - Bochs PC emulator for the Browser (Source)

• 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)
• 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)
• 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
• Simple 8-bit Assembler Simulator - Provides a simplified assembler syntax (based on NASM) and is simulating a x86 like CPU (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)

• Babbage's Difference Engine (First funded 1823, first full build in 1855, first full rebuild in 1991)
• Turing machine simulated in JavaScript. See here for more information. (1936)
• Z1 machine's adder in 3D JavaScript/WebGL interactive simulation of the mechanical adder of Zuse's first machine. By Jakob Mischek (Source) (1938)
• Z3 machine's adder - ripple-carry electromechanical adder simulated in JavaScript, by Henry Raymond, Patrick Seewald and Vijeinath Tissaveerasingham. Explanation (1941)
• C88 - C88 computer simulation (The Homebrew CPU inspired by the SSEM) (1948)
• EDSAC on Browser - by NISHIO Hirokazu (Programming guide) (1949)
• WITCH Emulator - The Harwell Dekatron Machine, by Justin King. (Source and example programs) (1951)
• ElectroData/Burroughs Datatron 205 Emulator - by Paul Kimpel (Source) (1954)
• Digi-Comp 1 - educational plastic computer from 1963. Emulator by Larry Groebe and Kevin Williams. (1963)
• Burroughs B5500 emulator - Burroughs B5500 emulator in JavaScript (Source) (1964)
• CARDIAC - Bell Labs' CARDIAC cardboard computer from 1969. Instructions (1969)

• HP-35 - bug-compatible emulator by Ashley Feniello explained here using Eric Smith's and Jacques Laporte's work
• HP-35, HP-45, HP-55, HP-65, HP-80 - collection of HP Classics, based on Feniello's work, by Francois Roulet
• HP-45 - statically recompiled ROM by Norbert Kehrer
• HP-65 and HP-67 - with extra debug menu, by Greg Sydney-Smith
• Sinclair Scientific and TI-1500 - calculator simulations including full description of the algorithms and the reverse-engineering process. By Ken Shirriff
• TI-92 Plus emulator - JavaScript emulator for the TI-92 Plus

• HP-11C, HP-12C Platinum, HP-16C - by Elvis Pfützenreuter
• HP-15C - by Greg Hewgill. (Source)
• HP-21 and HP-29 by Greg Sydney-Smith (See here and here)
• HP-25 - by John Clenance
• HP-35 - JavaScript emulator by Neil Fraser
• HP-35 SOS - modified HP-35 with stack overflow sensing LED, by Hans Klaver, based on Fraser's work

• Compucolor II Emulator - JavaScript Compucolor II Emulator
• COSMAC Elf-ish - simulator by William Donnelly
• C1Pjs - JavaScript simulation of the Challenger 1P
• DCMO5 Online - Thomson MO5 JavaScript emulator
• Emscripten ScummVM - Emscripten fork of the ScummVM engine (Source)
• Heathkit ET3400 - by Phil Mainwaring. Click "Do" then "0000". (Instructions)
• IBM 5110 Emulator by Norbert Kehrer runs Basic or APL.
• jsH89 - Heathkit H89 emulator (runs CP/M) by Mark Garlanger
• JSVecX - JavaScript port of the VecX Vectrex emulator
• JsPspEmu - JavaScript PSP emulator (Source)
• NanoWasp - A MicroBee emulator
• Nascom 2 emulator by Tommy Thorn. (J to start Basic) (Source)
• PC-01 Lviv - An emulator for the PC-01 Lviv (Ukrainian home computer) (Source)
• Radio-86RK Radio-86RK emulator in JavaScript (Intel 8080 based 8-bit Russian home computer) (Source)
• KM-Z80 web emulator for Sharp MZ-80K, by Katsumi Morimatsu. GOTO $1200 to start KM-BASIC. (More information)
• Turbo Pascal - A web-based Pascal compiler that runs a subset of Turbo Pascal 5.5 code
• Virt.js - JavaScript emulation library (Source)
• jsMSX - The first MSX emulator 100% written in JavaScript
• jupiler - Jupiter Ace emulator written in JavaScript
• WebMSX - WebMSX, or simply WMSX, is a new MSX emulator designed for the Web (Source)

• A Big List of Browser-Based Emulators by Richard Moss
• Qaop/JS – Emulator links by Jan Bobrowski

This resource collection is maintained by Frederic Cambus

• Site : https://www.cambus.net
• Twitter: https://twitter.com/fcambus

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