TI-59

In late 1978 the 59's price fell into this college student's range and I quickly adapted my SR-56 programs to this machine, and saved them! I wrote many larger programs, including an ephemeris for each planet. I even modeled the reflectivity of Pluto for a professor. I have kept it all these years and, with fresh batteries, it still reads those old cards.

Datamath Calculator Museum
R/S Programmable Calculators