Texas Instruments TI-89 사용자 설명서

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

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

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

and

Increase (darken) the contrast

and

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