Texas Instruments TITANIUM TI-89 - Manual (Page 147)

Operating the Calculator 147
APD does not occur if a calculation or program is in progress, unless the program is
paused. If a program is running, but waiting for a key press, APD will occur after several
minutes of inactivity.
Setting the Display Contrast Setting the Display Contrast Setting the Display Contrast Setting the Display Contrast
The brightness and contrast of the display depend on room lighting, battery freshness,
viewing angle, and the adjustment of the display contrast. The contrast setting is
retained in memory when the graphing calculator is turned off.
Adjusting the Display Contrast Adjusting the Display Contrast Adjusting the Display Contrast Adjusting the Display Contrast
You can adjust the display contrast to suit your viewing angle and lighting conditions.
Contrast keys
If you press and hold 8 | or 8 « too long, the display may go completely black or
blank. To make finer adjustments, hold 8 and then tap | or «.
To: Press and hold both:
Decrease (lighten) the contrast 8
and
|
Increase (darken) the contrast 8
and
«
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