Does anyone know what kind of tool to use to open a TI-89 (or TI-83+, they look the same)? I can see my good ol' phillips screwdriver isn't going to work. If someone could post the tool (and size), I'd appreciate it greatly. Maybe it needs an allan (sp?) wrench, but none of mine seem to fit. Zach Schoen scho0521 at d.umn.edu