This link doesn't appear to work, and we have no local backup of it :( <br/>You can try it anyway: <a href='http://education.ti.com/calculators/downloads/US/Software/Download/en/6106/6601/68k_ranger_guidebook_en.pdf'>http://education.ti.com/calculators/downloads/US/Software/Download/en/6106/6601/68k_ranger_guidebook_en.pdf</a>