The files in this directory include sources for: xising a two dimensional Ising model simulator xpotts for the two dimensional Potts model xautomalab a totalistic cellular automaton simulator xsand for the Bak, Tang, Wiesenfeld sandpile model xfires a simple forest fire automaton xtoys.tar all the files combined amiga a directory containing amiga sources for similar programs For each source there is a corresponding .txt readme file. Makefile is kind of trivial, but it is here for those that like such things. At present, all except xising and xautomalab require a color monitor. I want these to compile under generic X; so if you have problems on some machine supporting X, I would appreciate knowing so I can fix things. Mike creutz@bnl.gov