Has anyone had this problem? I have ZSHELL and a few zshell programs on = my calc, but I can't seem to use the 85's fMin and fMax functions to say = the maximum value of, say, a parabola. Thanx. _,.-+~*`'`*~+-.,_,.-+~*`'`*~+-.,_,.-+~*`'`*~+-.,_ Chris Thielen striker@uslink.net