JSMESS – The JavaScript MESS (Multi Emulator Super System) ( Source).

jTandy – Another JavaScript TRS-80 emulator.

MC-10 Emulator – Emulator for the TRS-80 MC-10 microcomputer.

jBacteria – The smallest JavaScript Spectrum emulator.

ZX80 Emulator – JavaScript ZX80 Emulator.

JSSpeccy – A ZX Spectrum emulator in JavaScript ( Source).

Miracle – Sega Master System emulator ( Source).

jsSMS – JavaScript Sega Master System & Game Gear emulator ( Source).

jsbochs – Bochs PC emulator for the Browser ( Source).

jemul8 – An object-oriented JavaScript x86 emulator for Node.js and the Browser ( Source).

Virtual x86 – An x86 emulator written in JavaScript ( Source).

JsDOSBox – JavaScript PC DOS emulator ( Source).

n64js – An N64 emulator in JavaScript ( Source).

mupen64plus – A port of the popular Nintendo 64 emulator for the Web ( Source).

jsGB – A GameBoy emulator in JavaScript ( Source).

fam – JavaScript NES emulator ( Source).

XNES – Experimental JavaScript Super Nintendo emulators ( Source).

Nezulator – A NES emulator in JavaScript.

JSNES – A JavaScript NES emulator ( Source).

IodineGBA – A GameBoy Advance emulator written entirely in JavaScript ( Source).

GameBoy Online – JavaScript GameBoy Color emulator ( Source).

GBA.js – Game Boy Advance in the Browser ( Source).

CycloaJS – JavaScript NES Emulator ( Source).

1964js – JavaScript port of the 1964 N64 emulator for Windows.

pdp11-js – PDP-11 emulator with UNIX V6.

PDP-11 Emulator – A JavaScript PDP-11 emulator.

VICE.js – Versatile Commodore Emulator for JavaScript ( Source).

VIC-20 Emulator – JavaScript VIC-20 emulator.

SAE – Scripted Amiga Emulator ( Source).

JSC64 – Commodore 64 emulator written in JavaScript ( Source).jsA8E – JavaScript version of the A8E Atari 800 XL Emulator.EstyJS – A pretty fast and functional JavaScript Atari ST emulator ( Source).Apple2JS – A JavaScript emulator for the Apple II.a2 – A fast, WebGL optimized Apple ][+ emulator.Apple IIjs – An Apple ][ Emulator in JavaScript.Roland – An Amstrad CPC emulator written in JavaScript.CPCBox – Amstrad CPC emulator in JavaScript.I’ve pasted the list below, but special thanks to Frederic Cambus who compiled the list. There’s a great list over at Github of about 50 emulators written in Javascript.

Online emulator ps2