I am looking now for a program on the TI92 that calculates formulas like Ay''+By'+y=f(x). I found one called "vop.92@" but that is converted for paralell links. So now I am looking for the "standard" files of that program or a PC-program to reconvert it into *.92p or *.92g files. Thanks in advance Juergen Schultz at : Juergen.Schultz@fh-Zwickau.de