TI-85 Feature List

TI-85 Feature List

Expression evaluation with standard arithmetical operations and parenthetical grouping.
8*21 character display allows easy editing of expressions and programs.
Last entry and last answer are stored for quick recall.
Mathematical functions include numerical operations, probability, angle calculations in radians or degrees, and trigonometry.
Manipulation of complex numbers in rectangular or polar form.
Numbers expressed in floating point, scientific notation, or engineering notation, or to a fixed number of decimal places.
Display numbers in fractional form.
Convert between decimal, hexadecimal, binary, and octal number bases.
Boolean logic, bit manipulation functions, and test operators.
Manipulate lists of real or complex values.

List editor
Generate large lists automatically with seq() function.

Manipulate matrices and vectors of real or complex values.

Matrix and vector editor.
Convert vectors between polar, cylindrical, and spherical form.
Matrix math

Determinant
Transposing
Row echelon and reduced row echelon form
Frobenius norm
Eigenvalues, eigenvectors
Row and column norm
Lower-upper decomposition

Unit conversions

Distance
Area
Volume
Time
Temperature
Mass
Force
Pressure
Energy
Power
Speed

15 internal physical constants

User can define real or complex constants.

Manipulation of strings.

Greek and international characters available.

Equation variables hold formulas without the need to write a program.
Iterative calculus functions including 1st and 2nd order derivative, length of a curve, numeric integration, and minimum and maximum of a function.

Tolerance settings for accuracy/speed balance.

Graphing

Graph types

2D functions
Polar functions
2D parametric
Differential equations

Graph up to 99 of each type simultaneously.
Trace cursor along graph.
Zoom operations.
Mathematical analysis and calculus operations of graph. (approximate results)

Find intersection of two curves.
Find length of a curves.
Find slope of point on curve.
Graph the derivative of a function.
Find the area of a region bounded by two curves.

Lines, circles, and pixels can be drawn on graph.
Save pictures of graph and databases of graph (small file which holds graph functions and settings).
127*64 graph resolution

Statistics

Enter values in dual-list editor (2 lists at a time).
Regression models

One-variable
Linear
Logarithmic
Exponential
Power
2nd to 4th order polynomial

Draw statistical plots.

Histogram
Scatterplot
Points with connecting lines
Regression curve

Forecast values using regression model.
Create equation using regression model.

Equations (approximate solutions)

Solve any equation for single value, with user supplying initial guess.

Solver application allows setup of "what-if" situations.

Solve polynomials up to 30th order.
Solve system of up to 30 simultaneous equations.
Interpolator application allows predicting an x or y value given two points on a line.

Programming

All calculator features except calc-to-calc linking available from programs.
Simple, BASIC-like language.
Standard program control and looping instructions.
Instructions available for user input and displaying data.

I/O ports

Calculator can connect to another TI-85 or a TI-86 (TI-86 available in summer 1997).
Exchange data and memory backups.
Optional accessories: TI-Graph Link, CBL, CBR, overhead projector (requires custom-made calculator, contact TI).

Variables

All data can be stored to variables.
No limit to number of variables, memory permitting.
Variable names up to 8 characters, case-sensitive.
28226 bytes available for data storage.
All data is retained when calculator is off and while changing batteries.

Custom menu allows easy access to 15 frequently used commands chosen by user, and execution of assembly programs.

Note: Assembly programming not supported by TI.

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Copyright 1997 Jeff Tyrrill