Introduced: ca. 1976
The Interton PC 6020 is one in a series of similar calculators by
Interton (others in this series are the simpler PC 6010 and the
scientific PC 6040).
This calculator as a built-in non user-replaceable rechargeable battery. I was amazed that the battery still worked perfectly well when I got this PC 6020 in the year 2001!
This calculator has a couple of nice functions, like a "DP" (Digital Precision) key to fix the number of display digits, and the "M+=" and "M-=" keys.
Also noteworthy are the display's 6 and 9, which exist out of only 5 segments.
©2009 Ernst Mulder