The title is a tiny bit misleading. Indeed all of those are JavaScript emulators, but not all of them were written in JS. At least one on the list (mupen64plus) is transpiled from C++ using the (amazing) emscripten.

This appears to be ripped from the original list here, which is also more uptodate:

https://github.com/fcambus/jsemu

How many of them are proper, accurate emulators though (and not emscriptened ones like mupen64)? Parsing bytes and mapping them to instructions is easy, and I believe that's why most of them are for very simple machines. We're still very far away from having multiple PS1/N64 era that are running at a tolerable framerate.

Except 1964js, which works in a way that both amazes me and makes me feel dirty at the same time.

small & easy linux-like in-browser emu: http://bellard.org

fullscreen, "Unix-like virtual shell", u.a. ssh(!?); ping(ok) "-": no c&p, http://cb.vu/

think, there are some more Linux & unix Emulators in js? would be nice, find some in next comments. :-)

Try https://github.com/copy/v86 and https://github.com/s-macke/jor1k/

The latter one even has complete network support.

Intresting that SNES is missing from the nintendo list. There's a good bit of literature on the underlying implementation for SNES roms: https://github.com/bttf/snes_dev

(Full disclosure: I spent a little time accumulating aforementioned literature)

XNES[1] is mentioned, which links to a page with several other us ports including SNEM and SNES9x.

[1] http://tjwei.github.io/xnes/

I wrote a Chip-8 emulator (VM?) in C# and then tweaked it so that Bridge.NET could compile it down to JavaScript:

https://blog.dantup.com/2016/06/dachip8js-my-csharp-chip8-in...

I wrote one in JavaScript directly some time around 2012 or 2013. http://chip8.progr.am/chip8.html

Hey, this is very cool. Thank you.

Also missing a 6502 emulator I wrote in Go that is transpiled to JavaScript using Gopherjs: https://play.dodolabs.io/?code=89e9a475

Can't wait to see some of these ported to WebAssembly.

My 8-bit multisystem emulator has both an asm.js and WebAssembly version:

asm.js: http://floooh.github.io/virtualkc/index.html

WebAssembly: http://floooh.github.io/virtualkc/index_wasm.html

I would actually be more interested in the ones that are actively maintained. Many tend to come and go, NESBox being one that comes to mind.

Missing a TI calculator emulator I wrote in C that can be compiled with emscripten and run in the browser (does that count?):

https://github.com/KnightOS/z80e

Oh neat! I've been dabbling with a similar project for the TI Voyage 200... the Emscripten version isn't in the repo, but it's relatively straightforward to make work.

https://github.com/duskwuff/v200

Some of these are not emulators, they are just code translated to Javascript, or e.g. compilers written in Javascript.