HP 15C User Manual (English)

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HP-15C

HP-15C Quick Reference

 A. Thimet

Memory & Display

Memory Approx. 462 bytes of memory corresponding to 66 registers, 7 bytes each,

4-level stack, Last-X, index register I.

Nonvolatile memory, mostly merged program commands (1 byte per

instruction)

Pr Error Displayed when the contents of the nonvolatile (continuous memory) has

been lost

Number

separator

Turn off, press & hold ON, press ".", release ON, release "."

This toggles between using a dot or comma for the decimal separator.

Global

reset

Turn off, press & hold ON, press "-", release ON, release "-"

This clears all permanent memory!

MEM Displays memory assignment in the form "RR UU pp – n" with:

RR: Number of highest storage register. At least 1 which means that R0, R1

and the index register I are always present. Register 0-19 correspond to

0-9 & .0-.9 and can be accessed directly by STO/RCL. Higher registers

can be reached thru indirect addressing only.

UU: Number of uncommitted registers. Use DIM to commit them to storage

registers. Uncommitted registers are automatically converted to

program space when needed.

pp: Number of registers containing program instructions. One register

consists of 7 bytes and can hold 7 program steps (except for a few

instructions that occupy two bytes).

n: Number of bytes left before next uncommitted register is converted to

program space.

In total there are 66 registers corresponding to 462 bytes.

The initial setup is "19 46 0-0": 20 storage registers (0-19), 46 uncommitted

registers, corresponding to approx. 322 program steps.

DIM (i) Use this command to select the number of registers committed to storage.

The argument must be passed in X. It specifies the highest storage register

number.

Registers containing program instructions cannot be converted to storage

registers!

X must be at least 1 so there will always be R0 and R1 available.

The maximum is 65

FIX 0-9 Select fix-point format

SCI 0-9 Select scientific format with exponent

ENG 0-9 Select engineering format with exponent always being a multiple of 3

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HP 15C Specifications

General

Memory registers	65
Storage media type	-
Type	Scientific
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black, White
Housing material	Plastic
Digits	10 digits
Display type	LCD
Display number of lines	1 lines
Battery type	CR2032
Power source	Battery
Auto power off	Yes
Auto power off after	5 min
Number of batteries supported	2