Hewlett-Packard HP 28S (Clamshell? ORLANDO)

Hewlett-Packard HP 28S
The Hewlett-Packard HP 28S is a graphing calculator with 10 digits precision and RPN (reverse polish notation) logic. It has 1500 functions, 78 keys, and an LCD (liquid crystal) display.

Facts at a glance:

Feature Value
Type: Graphing
Functions: 1500
Keys: 78
Precision: 10
Logic: RPN
Display type: LCD
Display size: 137
Printer: IR ext
Length: 165mm
Width: 191mm
Thickness: 13mm
Weight: 227g
Year introduced: 1988
YearDiscontinued: 1992

See other calculators by Hewlett-Packard