HP Forums

The TI-81 is not quite as feature full as the HP 28C, however it was the calculator that got me into graphing calculators.

Part 1: (10/5/19)

Differences between the TI-81 and TI-84 Plus
Binary/Decimal Conversions
Quadratic Equation

http://edspi31415.blogspot.com/2019/10/f...art-i.html


Part 2: (10/6/19)

Decimal to Fraction
Simple Logistic Regression
Confidence Interval
Fresnel Polarization
Hyperbolic Circles

http://edspi31415.blogspot.com/2019/10/f...rt-ii.html

I remember it fondly. Bought it at the end of 1991 and wrote a program to convert matrices to reduced row echelon for my Linear Algebra class in university. Still have it and use it.