I have just started using the Ostebee-Zorn book this year for Calculus AB. Many of my students own a TI-85 with some sort of program that will do basic tables. However, in our text, they often ask students to find limits of functions that are undefined at some value and difficult to analyze by just looking at the graph. The 82's and 83's table feature allows a much better picture of what is happening on either side of a given point. Does anyone know of a table program that will print "Error" or deal with undefined values on the TI-85? Thanks.