HP-25 Scientific Programmable Pocket Calculator Specifications

Pre-programmed functions

Trigonometric (all in decimal degrees, radians, or grads): Sin x: Arc Sin x: Cos x: Arc Cos x: Tan x; Arc Tan x.

Logarithmic: Log x: Ln x; e5; 10^x.

Statistical: mean and standard deviation.

Other: conversions between decimal hours, degrees, radians, or grads and hours (degrees)/minutes/ seconds: rectangular/polar coordinate conversions, integer/fraction truncation: absolute value; full register arithmetic.

Programming features

49-step program memory; conditional branching based on any of eight relational tests (x<0,=’’>_0, x#0, x = 0): direct branching: ability to review or execute programs step-by-step: ability to add or modify program steps; PAUSE and NO-OPERATION program instructions.

<0,=’’>General

<0,=’’>Memory: eight addressable registers; four-register operational stack; ’last x’ register.

Display: up to 10 significant digits in fixed-decimal notation: up to 8 significant digits plus 2-digit exponent in scientific or engineering notation (in engineering notation all exponents are displayed as multiples of +/-3): full display formatting in any mode with selective round-off: indicators for improper operations: low battery; line-number/key matrix program display.

Dynamic range: 10-99 to 1099 (200 decades).

Power: AC: 115 or 230 V. +/- 10%, 50 to 60 Hz, 5 watts. Battery: 2.5 V dc nickel-cadmium rechargeable battery pack.

Dimensions: length: 13.0 cm (5.1’). Width: 6.8 cm (2.7’). Height: 3.0 cm (1.2’).

HP-55 Advanced Scientific Programmable Pocket Calculator Specifications

<0,=’’>Pre-programmed functions

<0,=’’>Trigonometric: same as HP-25.

Logarithmic: same as HP-25.

Statistical: two-variable mean and standard deviation; n!; linear regression. Metric Conversions: in/mm: ft/m: U.S. gal/I; lbm/kg: lbf/N.

Other: same as HP-25 plus: hours (degrees) minutes/seconds arithmetic: degrees/radians conversion; full register arithmetic on first 10 addressable memories.

<0,=’’>Programming features

<0,=’’>49-step program memory; conditional branching based on either of two relational tests; direct branching; ability to review or execute programs step-by-step; ability to add or modify program steps.

Digital timer

0 to 100-hour range; +/-0.01% accuracy; displays hours/minutes/seconds/hundredths; stores up to 10 partial times (‘splits’).

General

Memory: 20 addressable memories; four-register operational stack; ’last x’ register.

Display: up to 10 significant digits plus 2-digit exponent and appropriate signs; fixed-decimal or scientific notation. both with selective round-off. indicators for improper operation, low battery; line-number/key-matrix program display; hours/minutes/seconds/hundredths timer display.

Power: AC: 115 or 230 V. +/-10%, 50 to 60 Hz. 5 watts. Battery: 500 mW derived from nickel-cadmium rechargeable battery pack. Dimensions: length: 14.7 cm (5.8’).. Width: 8.1 cm (3.2’). Height: 1.8 to 3.3 cm (0.7 to 1.3’).

HEWLETT PACKARD CALCULATORS & PERIPHERALS

Measurement + Computation Catalogue 1976