This page is dedicated to my favorite handheld calculator, the TI-30Xa. I made it to serve several purposes: To practice my test-driven development. A suite of tests have already run by the time your ...

The voltages and signal timings described below are dependent on the battery voltage and are probably also impacted by temperature. While the calculator runs on a 9 V battery, internally the logic ...

We are a nonpartisan and nonprofit news organization dedicated to investigating systems that contribute to inequality in our country.