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76 Programming

you

can

see,

the

program

memory

for

the

HP-25 is

separate

from

the

four

stack

registers, the

LAST

X register,

and

the

eight

storage

registers.

WithJ

Jdisplayed in

PRGM

mode

, you

are

ready

key

your

program.

Surface

area

sphere

calculated

using

the

formula

A =

7Td

•

The

short

list

keys

for

the

area

sphere

program

shown

below:

Keys

Comments

These

keys

square

the

diameter.

}

These

keys

place

the X-register.

This

key

multiplies d

7T.

Keycodes

Press

the first key

the

program

and

the display will

change

to:

15 J

The

two

numbers

the

right

the

display designate

the

key

stored

that

step.

Each

key

the

keyboard

has a two-digit

keycode

For

convenience,

the

digit

keys

are

coded

through

09. All

other

keys

are

coded

their

position

the

keyboard.

The

first digit

denotes

the

row

the

key

and

the

second

digit the

number

the

key

that

row.

tells

you

that

the

key

the

first row

the

calculator

and

that

it is the fifth

key

that

row,

the

iii

key.

1st Row

5th Key

This

handy

matrix

system

allows

you

to easily

determine

the

code

for

each

instruction

without

using a

reference

table.

Questions and Answers:

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Do you have a question about the HP 25 and is the answer not in the manual?

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

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