calculator.org the calculator home page

Hewlett-Packard HP 55 Classic MERLIN

The Hewlett-Packard HP 55 Classic MERLIN is a programmable calculator with 12 digits precision and algebraic logic. It has 75 functions, 35 keys and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 3xAA batteries.

Facts at a glance:

Type Programmable
Functions 75
Keys 35
Precision 12
Logic Algebraic
Display type LED
Display size
Printer
Length 147 mm
Width 81 mm
Thickness 33 mm
Weight 255 g
Power Source 3xAA
Country
Original price unknown
Est. current value unknown
Year introduced 1975
Year discontinued 1977

See other calculators manufactured by Hewlett-Packard.