series of graphing calculator s developed by Texas Instruments . This line currently includes the TI-Nspire and TI-Nspire CAS . It is available as a handheld and also as software for Windows and Mac OS X . In 2010, Texas Instruments updated the calculators to the [http://education.ti.com/educationportal/sites/US/homePage/nspire-family.html Touchpad versions] which come