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Texas Instruments TI-83-Plus User Manual

Texas Instruments TI-83-Plus
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84 Chapter 2: TI-83 Plus Specific Information
TI-83 Plus Developer Guide Third Release May 28, 2002
SaveScreen
Copies a bit image of the current display to RAM.
DisplayImage
Display a bit map image.
RunIndicOff
Disables the run indicator located in the upper right corner of the
display. See the Run Indicator section for further information.
RunIndicOn
Enables the run indicator located in the upper right corner of the
display. See the Run Indicator section for further information.
AllEq
Selects or deselects all graph equations in the current graph
mode
SetAllPlots
Selects or deselects all stat plots.
SetTblGraphDraw
Sets the graph to dirty, which causes a complete regraph the
next time the graph is brought to the display.
Stat Plots
Stat plots provide a way to display data stored in list variables. The SetAllPlots routine
will select or deselect all stat plots. Each stat plot has a portion of System RAM
allocated to store its settings. To select/deselect or change settings for an individual
stat plot, you must modify this RAM.
There are three bytes that determine if a plot is on or off:
P1FrqOnOff
Plot 1, 0 = off; 1 = on
P2FrqOnOff
Plot 2, 0 = off; 1 = on
P3FrqOnOff
Plot 3, 0 = off; 1 = on
The high 4 bits of these bytes determine which axis the data will be plotted on if the plot
type is Normal Probability Plot. 0 = X axis, 1 = Y axis.
There are three bytes that determine the type of plot to be drawn:
P1Type
Plot 1 type
P2Type
Plot 2 type
P3Type
Plot 3 type
0 = Scatter Plot
1 = XY Line
2 = Modified Box Plot
3 = Histogram
4 = Box Plot
5 = Normal Probability Plot

Table of Contents

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Texas Instruments TI-83-Plus Specifications

General IconGeneral
Display TypeLCD
Display Resolution96 x 64 pixels
Power Source4 AAA batteries
Programming LanguageTI-BASIC, Z80 Assembly
Backup PowerCR1616 or CR1620 lithium battery
RAM24 KB
ProcessorZilog Z80
Weight7.4 oz (210 g) with batteries
Dimensions7.3 x 3.5 x 0.9 inches

Summary

Introduction

Conventions Used in this Guide

Defines conventions for program text, syntax, and optional parameters in guide examples.

Purpose of this Guide

Explains the types of programs that can be created and the guide's focus on Flash ROM apps and RAM assembly programs.

TI-83 Plus Specific Information

ARCHITECTURE

Describes the TI-83 Plus architecture composed of several layers: Hardware, Drivers, Tools, and Programming.

HARDWARE LAYER

Covers the Zilog Z80 CPU, RAM, and Flash ROM components of the TI-83 Plus unit.

Z80 RAM Structure

Explains the 32K RAM partitioning into areas like System RAM, User RAM, and Floating Point Stack.

Flash ROM Structure

Details the 512K Flash ROM composition, divided into 32 pages of 16K each.

System Routines

Explains accessing TI-83 Plus system routines using Z80 RST instruction and macro-instructions.

Variable Naming Conventions

Outlines rules for naming variables, including predefined and user-defined names and their formats.

System Variables Area

Describes preallocated system RAM variables essential for built-in functionality.

DRIVERS LAYER

Covers keyboard input, display access, and link port communication functionalities.

Display

Details accessing the TI-83 Plus display via system routines or directly writing to the display driver.

Graphing and Drawing — What’s the difference?

Differentiates between pixel-based drawing routines and graph routines tied to WINDOW settings.

TOOLS AND UTILITIES LAYER

Covers essential development tools like error handlers, utility routines, and debugging features.

Error Handlers

Explains setting up error exception handlers using AppOnErr and AppOffErr macros to capture system errors.

Temporary Variables

Discusses temporary variables used for intermediate results and their management.

Entering and Exiting an Application Properly

Details how applications interact with the TI-83 Plus application loader and state monitor.

Application Development Process

PROGRAMMING LAYER

Covers the final layer of TI-83 Plus architecture, focusing on TI BASIC, ASM, and Applications.

Applications

Defines applications as Flash ROM programs, their PC creation, signing requirements, and larger scale.

DEVELOPMENT SYSTEM

Introduces the simulator for general development, setup, and sample application creation.

Using the Simulator System — Requirements for Getting Started

Lists requirements for TI-83 Plus application development using Zilog Developer Studio and TI Simulator/Debugger.

Debugging the Application

Demonstrates setting breakpoints, modifying RAM, and using the Memory Map view for debugging.

Downloading the Application

Explains using TI GRAPH LINK or TI Connect to download applications to calculators.

Development Tools

DEVELOPMENT ARCHITECTURE

Outlines the TI development architecture based on the TI simulator/debugger and Zilog Developer Studio.

TI SOFTWARE SIMULATOR AND DEBUGGER

Describes the TI-83 Plus simulator for debugging applications, detailing menu options and operations.

Breakpoints

Explains setting and removing breakpoints via the manual setup dialog box in the debugger.

CPU View Window

Displays processor information such as index registers, stack pointer, and flags.

Flash View Window

Displays entire Flash memory contents, allowing address viewing and toggling between physical/logical modes.

RAM View Window

Displays entire RAM contents, allowing address viewing and toggling between physical/logical modes.

Key Press Recording and Playback

Allows recording and playing back key presses, with setup options for files and rates.

Support in Writing Applications

Lists resources for help in writing TI-83 Plus applications, including guides and tutorials.

Glossary

TI-83 Plus “Large” Character Fonts

TI83 Plus “Small” Character Fonts

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