is there any [legal, of course] calculator software? i wish to have the software on my computer so i have a version of the TI 89 available even if i forget my calculator.

Online software :

wolfram alpha dot com

OR

mathematica

( Manufactured also wolfram research )

On your computer you have calculator:

start -> Programs -> Accessories -> Calculator

When you open Calculator click:

View

then

Sceintific

Yes, there are legal calculator software options available that can be installed on your computer. To have a virtual version of the TI-89 calculator on your computer, you can use a software emulator. Here's how you can get a legal calculator software:

1. Emulator Software: Look for a TI-89 emulator software that is compatible with your computer's operating system. There are several options available, such as Virtual TI (VTI) and TI-SmartView.

To get Virtual TI:
- Go to the Virtual TI website or search for it online.
- Download the appropriate version for your operating system.
- Install the software on your computer.
- Follow the instructions provided to set up the emulator.

To get TI-SmartView:
- Visit the Texas Instruments website or search for TI-SmartView online.
- Look for the TI-89 version of the software.
- Purchase and download the software from the official Texas Instruments website.

2. Installation: Once you have downloaded the emulator software, follow the installation process by running the installer and following the on-screen instructions. Make sure to choose the appropriate options during installation and select the TI-89 model.

3. Usage: After installation, you can launch the calculator emulator as you would any other software on your computer. The emulator should provide you with a virtual version of the TI-89 calculator, replicating its functionality and interface on your screen.

Please note that while the emulator software itself is legal, it is important to use it responsibly and in accordance with your educational institution's policies.