I have MMX emulator for PC's that doesn't have MMX. (mine have
![](http://www.gamedev.net/community/forums/ubb/wink.gif)
But it works only under windows (really, it's easy to write your own for DOS)
If you will find any 3dNow! or Pentium II/III emulators, i'll be happy to get a copy
FlyFire/CodeX
http://codexorg.webjump.com