T-Calc Scientific Calculator
TCalc was an RPN scientific calculator with both screen and numeric-keypad entry. Coupled with the dual X and Y viewers, cutting and pasting of input and answers form the major advantage of T-Calc over hand-held calculators.
Functions included: arithmetic, trig and inverse, hyperbolic and inverse, logarithms and powers, summation and standard deviation. T-Calc creates a record of all calculations in its Log Window—invaluable for tracing and validating your work.
Triakis. Inc.
$34