If it is the RF/Magnetic shield you are talking about, Yes this will cause your calc to stop working.. Lindoran ---------- > From: Erik Buehler <erikb@ksu.edu> > To: list-fargo@lists.ticalc.org > Subject: LF: foil > Date: Tuesday, November 19, 1996 5:28 PM > > What does the foil in the ti-92 do? Would it be bad to remove it? > Erik Buehler > Email me at: erikb@ksu.ksu.edu