I did some checking and found that there is an Atari ST emulator for the Pocket PC. I didn't go any further than finding some webpages talking it. Maybe you could run it that way.
http://www.myatari.net/issues/apr2003/castce.htm
http://www.freewareppc.com/utilities/castce.shtml
http://castaway.sourceforge.net/castce.html