ss="rvts6">FCEU "mappers modified" is an unofficial build of FCEU Ultra by CaH4e3, which supports a lot of new mappers including some obscure mappers such as one for unlicensed NES ROM's.</span></p>
<p class="rvps2"><span class="rvts6"><br/></span></p>
<p class="rvps2"><span class="rvts6">FCEUX supports mappers from older versions of FCEU-mm.</span></p>
<p class="rvps2"><span class="rvts6"><br/></span></p>
<p class="rvps2"><a class="rvts24" href="http://sourceforge.net/projects/fceumm/">FCEU-mm SourceFo