Hewlett-Packard HP 20S (Pioneer ERNI)

Hewlett-Packard HP 20S
Image: Wikimedia CC BY-SA 3.0
The Hewlett-Packard HP 20S is a programmable calculator with 12 digits precision and algebraic logic. It has 160 functions, 37 keys, and an LCD (liquid crystal) display. The power source is 3x1.5V cell.

Facts at a glance:

Feature Value
Type: Programmable
Functions: 160
Keys: 37
Precision: 12
Logic: Algebraic
Display type: LCD
Length: 148mm
Width: 80mm
Thickness: 15mm
Weight: 120g
Power Source: 3x1.5V cell
Year introduced: 1989
YearDiscontinued: 1990

See other calculators by Hewlett-Packard