HP 15c Collector's Edition User Manual

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Appendix G
Differences Between the
HP 15c CE and HP-15C
Performance
The CPU of the HP 15c CE is more than 200 times faster than the CPU in
the original HP-15C. Due to overhead, real-world performance does not
increase by this much, but typical operations are 10–20 times faster than
on the HP-15C.
If a program written for the original HP-15C relies on special timing, for
example if the expected run-time of a program gives the user a fixed time
to react, then that program will need to be slowed down on the HP 15c CE,
possibly by the addition of © (pause) steps or by making loops repeat
more times.
Memory
The HP 15c CE provides 50% more memory than the HP-15C—672 bytes
instead of 448 bytes. This increases the number of allocatable storage
registers from 64 to 96.
This means the | W function, which displays the available registers
and their allocation, will appear different due to the increased memory on
the HP 15c CE. The default allocation shows “19 78 00-0” instead of
“19 46 0-0”.
The original HP-15C was limited by memory to a maximum matrix size of
8 × 8. Despite the increased memory of the HP 15c CE, the limit of 8 × 8
remains for matrix inverse, determinant, and division.

HP 15c Collector's Edition Specifications

General

Model	HP 15c Collector's Edition
Category	Calculator
Type	Scientific
Power Source	Battery
Manufacturer	HP
Display	LCD
Functions	complex numbers, matrix operations

Summary

Introduction

This Handbook

Outlines the structure of the manual, detailing its parts and how to use it for learning.

The HP Community

Discusses user groups and websites for HP calculator enthusiasts and information sharing.

Part I: HP 15c Fundamentals

Section 1: Getting Started

Covers basic operations like powering on, keyboard layout, and primary/alternate functions.

Section 2: Numeric Functions

Explains essential numeric operations including logs, trig, powers, and conversions.

Section 3: The Automatic Memory Stack, LAST X, and Data Storage

Details the RPN stack, LAST X register, and data storage operations.

Part II: HP 15c Programming

Section 6: Programming Basics

Introduces core programming concepts: creating, loading, running programs, and memory.

Section 8: Program Branching and Controls

Covers controlling program flow using branching, loops, and conditional tests.

Part III: HP 15c Advanced Functions

Section 11: Calculating With Complex Numbers

Covers entering, manipulating, and performing calculations with complex numbers.

Section 12: Calculating With Matrices

Explains matrix operations, including dimensioning, element access, and calculations.

Section 13: Finding the Roots of an Equation

Details using the SOLVE function for numerical root finding and equation solving.

Section 14: Numerical Integration

Explains how to perform numerical integration using the ∫f(x)dx key and subroutines.

Appendix A: Error Conditions

Error 8: No Root

Explains the error when the SOLVE function cannot find a root.

Error 0: Improper Mathematics Operation

Lists and explains errors related to mathematical operations and illegal arguments.

Appendix D: A Detailed Look at SOLVE

How SOLVE Works

Explains the numerical technique and logic behind the SOLVE algorithm.

Finding Several Roots

Discusses methods for finding multiple roots of an equation using the SOLVE function.