         E                          s  olEm
         m                          k o
  musk     u   ol  uskool   skoolE    o l          uskoolEmu  o      k
  u        s ool  u      m s      u   o E         u    l    k o      o
   koolE   koo    s      u k      s   l muskoolE  s    E    o l      o
        u  oolE   k      s o      k   E u         k    m    o E      l
        s  o  mu  o      k o      o   m s         o    u    l m      E
olEmus   l    ko lEmusk   Emusko    u  oolEmus  o    s    E  skoolE

LIVE DEMO
Download at GitHub

I personally recommend reading the readme first.

JSNES

XNES

mupen64plus-js

Gameboy-Online