Texas TI-86 用户手册

99APPX.DOC   TI-86, Appendix, US English   Bob Fedorisko   Revised: 02/27/01 1:20 PM   Printed: 02/27/01 1:26 PM   Page 392 of 26

99APPX.DOC   TI-86, Appendix, US English   Bob Fedorisko   Revised: 02/27/01 1:20 PM   Printed: 02/27/01 1:26 PM   Page 392 of 26

99APPX.DOC   TI-86, Appendix, US English   Bob Fedorisko   Revised: 02/27/01 1:20 PM   Printed: 02/27/01 1:26 PM   Page 392 of 26

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�   If you cannot see anything on the screen, you may need to adjust the contrast (Chapter 1).

♦ 

To darken the screen, press and release -, and then press and hold $.

♦ 

To lighten the screen, press and release -, and then press and hold #.

�   If an error menu is displayed, follow the steps in Chapter 1. Refer to the Error Conditions section

of the Appendix (page 393) for details about specific errors, if necessary.

�   If a checkerboard cursor ( Ä ) is displayed, then either you have entered the maximum number

of characters in a prompt or memory is full. If memory is full, press - ™ ', select a data
type, and then delete some items from memory (Chapter 17).

�   If the busy indicator (dotted line) is displayed in the top-right corner, a graph or program has

paused; the TI

-86 is waiting for input. Press b to continue or press ^ to break.

�   If the calculator does not seem to work at all, be sure the batteries are fresh and that they are

installed properly. Refer to battery information in Chapter 1.

All 

CHAR

 

GREEK

 menu items

are valid variable-name
characters, including the first
letter. 

 

(

-

 

~

)

 is not valid

as a character; 

 is a

constant on the TI

-

86.