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.

Acorn

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)

Amstrad

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

Apple

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

Atari

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

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)

DEC

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

Nintendo

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)

Sega

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

Sinclair

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

Tandy

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

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.

PC Emulators

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)

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)
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)

Early machines

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)

Calculator emulators

Microcode-level calculators

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

Workalike calculators

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

Miscellaneous

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)

Additional Information

This resource collection is maintained by Frederic Cambus

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

License

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

BigEd / jsemu