HP 25 User Manual

Contents
The HP-25 Programmable Scientific
Calculator
.............................. . . 5
Function Key Index . . . . . . .. . 5
HP-25
Memory . . . . . . . . . . 6
Programming Key Index . . . . . . . . . . . . . 6
The HP-25 Means Painless Programming 9
Manual Problem Solving 9
Programmed Problem Solving. . . . . . . . . . . . . 10
Section 1: Getting Started .......... . ... 13
Display. . . . . . . . . . . . . . . . . . . . . . . . . . .. . ... . ... . .... 13
Keyboard. . . . . . . . . . . . . . . . 13
Keying In Numbers . . .. . . . . . . . .. ... 14
Negative Numbers . 14
Clearing. .............. . .... 15
Functions ............ . . . . . . . . . . . .... 15
Chain Calculations. . . . . . . . . . . . . . ...... 18
A Word About the HP-25 ............ ... .. . . .. . . . . .. .... 22
Section 2: Controlling the Display .
Display Control Keys
Automatic Display Switching.
Keying In Exponents of Ten ...... . . .. . .
Calculator Overflow ........ . . . .. .
. .... 25
. 25
.
.. 30
..31
.33
Error Display ............................ . ... . . .. .. ... 33
Section 3: The Automatic Memory Stack
The Stack . . ............................ . . .
Initial Display . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .
Manipulating Stack Contents
Clearing the Stack
The mmm Key
One-Number Functions and the Stack.
Two-Number Functions and the Stack.
Chain Arithmetic.
Order of Execution.
Constant Arithmetic ........ .
Section 4: Function Keys
LAST X ........ . .
. 35
.... 35
.
.. 35
..... 35
... 37
.... 38
.40
. .. 40
.42
. .. 45
. .46
.. 49
.49

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm