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Texas Instruments TI-55 User Manual

Texas Instruments TI-55
92 pages
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© 2010 Joerg Woerner
Datamath Calculator Museum

Table of Contents

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Texas Instruments TI-55 Specifications

General IconGeneral
TypeScientific
Display TypeLED
Display Digits10
Power SourceBattery
Power9V
Memory Registers1
Programming StepsNot programmable
FunctionsTrigonometric, Logarithmic

Summary

Texas Instruments TI-55 Features and Functions

Algebraic Operating System (AOS)

Enables expression entry in stated order with parentheses for accurate interpretation.

Mathematical Functions

Covers arithmetic, trig, hyperbolic, log, factorial, percent, y^x, root, pi functions.

Addressable Memory System

Provides 10 memories for storing/recalling data with memory arithmetic capabilities.

Display Capabilities

Includes standard display, sci/eng notation, fix-decimal, and auto-clearing features.

Programmability & Portability

Discusses 32 program steps, portability, and unit conversions.

Texas Instruments TI-55 Basic Operations

Initial Operation & Power

Covers initial charging, battery life, power switch, and auto-display shutdown.

Data Entry and Display

Explains digit keys, decimal point, Pi key, and standard display format.

Exponent, Sign, and Clearing

Details EE, +/-, CE, CLR, and 2nd CA keys for operations and clearing.

Dual Functions and Notation

Explains using 2nd/INV keys and display formats like scientific notation.

Fix-Decimal Control

Allows selective choice of digits shown after the decimal point.

Arithmetic Calculations

Basic Arithmetic Keys

Explains +, -, x, ÷, =, x:y keys and their basic arithmetic functions.

Order of Operations & Parentheses

Details hierarchy of operations and parentheses for precise expression evaluation.

Math Functions

Fundamental Functions

Covers reciprocal, factorial, logarithms, and powers of 10 and e.

Trigonometric & Hyperbolic Functions

Explains sin, cos, tan, sinh, cosh, tanh functions and their inverses.

Roots, Powers, and Percentages

Covers square root, y^x, x√y, and percent calculations.

Angle Calculations

Explains angle modes (degrees, radians, grads) for trigonometric functions.

Memory Capabilities

Data Storage and Recall

Explains STO n and RCL n keys for storing and retrieving data from memory.

Direct Register Arithmetic

Covers SUM n, INV SUM n, Prod n, INV Prod n keys for memory arithmetic operations.

Memory/Display Exchange

Explains the EXC key for exchanging display and memory content.

Special Calculations

Constant Calculations & Conversions

Explains constant calculations and unit conversions.

Statistical Analysis

Covers Mean, Variance, Standard Deviation calculations.

Regression and Trend Analysis

Details linear regression, slope, intercept, correlation, and trend-line analysis.

Sample Math Problems

Vector Addition

Demonstrates adding vectors using coordinate conversion methods.

Area Calculations

Shows calculating the area of irregular polygons using geometric formulas.

Programming

Programming Fundamentals

Introduces programming for automating tasks and explains basic keys (Lrn, Rst, R/S).

Programming Examples

Demonstrates programming for mail order, conversions, area, and graphing.

Advanced Programming Techniques

Covers loops, zero check, derivatives, and differential equations.

Programming Notes

Provides notes on memory usage and key sequences for programming.

Appendix A: Maintenance and Service

Calculator Operation and Care

Discusses normal operation, battery charging, adapter use, and storage.

Battery Pack Replacement

Instructions for safely removing and replacing the calculator's battery pack.

Troubleshooting and Support

Symptom Analysis

Lists common problems and their potential causes for self-diagnosis.

Error Conditions

Explains flashing display and lists reasons for calculator errors.

Technical Assistance and Warranty

Provides contact info for support, service, and warranty details.

Appendix C: Displayed Results Versus Accuracy

Displayed Results vs Accuracy

Discusses rounding, guard digits, and the impact on calculation accuracy.

Mathematical Limits

Explains how accuracy can deteriorate near function limits or with large angles.

Appendix D: Instruction Codes

Instruction Codes

Explains the two-digit key codes used to represent keystrokes in programs.

Appendix E: Geometric Formulas

Geometric Formulas

Lists formulas for circumference, area, and volume of common geometric shapes.

Appendix F: Mathematical Expressions

Mathematical Expressions

Lists trigonometric relations, laws of exponents, and logarithms.

One-Year Limited Warranty

Warranty Information

Details warranty coverage, duration, performance, disclaimers, and service facilities.

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