Texas Instruments TI-89 Titanium Short User Manual page 27

Press Result
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Open Apps and split-screen status
Your TI-89 Titanium lets you split the screen to view two Apps
simultaneously. For example, view the Y= Editor and Graph screens
simultaneously to see the list of functions and how they are graphed.
Select the Split Screen mode from Page 2 of the MODE screen. The TI-89
Titanium displays the selected Apps in the split-screen view as shown.
Split the screen horizontally (top-bottom) or vertically (left-right).
Top-bottom split screen
Getting Started 21