Texas Instruments TI-83-Plus User Manual

Chapter 2: TI-83 Plus Specific Information 91
TI-83 Plus Developer Guide Third Release May 28, 2002
Run (Busy) Indicator
The run indicator is used by the TI-83 Plus to indicate that the calculator is busy while
computing. It is normally turned off while waiting for input from a user. When an
application is first started, the run indicator will most likely be running.
Applications have the option of using the indicator or not.
The indicator is updated by the interrupt handler, so if it is to be used, interrupts need to
be enabled.
RunIndicOff
Disables the run indicator located in the upper right corner of the
display.
RunIndicOn
Enables the run indicator located in the upper right corner of the
display.
There are two choices for the appearance of the run indicator:
• A short solid line that circles around from top to bottom — this is the default
indicator.
• A long dashed line that circles around from top to bottom — this is the Pause
indicator for the TI-83 Plus.
To use the Pause indicator, execute the following code before turning the run indicator
on:
LD A,busyPause
LD (indicBusy),A
If the Pause indicator is used, an application needs to set the default indicator back:
LD A,busyNormal
LD (indicBusy),A
Example of common usage:
EI
B_CALL RunIndicOn ; indicator on
B_CALL GetKey ; wait for a key
B_CALL RunIndicOff ; indicator off

Texas Instruments TI-83-Plus Specifications

General

Brand	Texas Instruments
Model	TI-83-Plus
Category	Calculator
Language	English