HP-15C

Common card · No. 478256

The HP-15C is a high-end scientific programmable calculator of Hewlett-Packard's Voyager series produced between 1982 and 1989. The "C" in the name refers to the continuous memory, such that the calculator retains its state when switched off.

Read on Wikipedia · Image HP-15C calculator, power on, showing square root of 88 (24623476512).jpg: striegel HP-15C Calculator-horizontal-2.jpg: Pittigrilli derivative work: Hic et nunc derivative work by combining both above…, CC BY 2.0