Texas Instruments TI-89, TI-92

22 Chapter 2: Operating the Calculator

02OPER.DOC TI

89/TI

92Plus: O

eratingthe TI

89/TI

92Plus (English) SusanGullord Revised:02/23/01 1:06 PM Printed:02/23/01 2:11 PM Page22 of 44

On the TI-89, while either type of alpha-lock is on:

¦ To type a period, comma, or other character that is the primary

function of a key, you must turn alpha-lock off.

¦ To type a second function character such as 2 [, you do not

need to turn alpha-lock off. After you type the character, alpha-

lock remains on.

There are certain times when you do not need to press j or

2 ™ to type alphabetic characters on the TI-89. Automatic

alpha-lock is turned on whenever a dialog box is first displayed. The

automatic alpha-lock feature applies to these dialog boxes:

Dialog box Alpha-lock

Catalog dialog box All commands are listed in alphabetical

order. Press a letter to go to the first

command that begins with that letter. See

page 44 for more information.

Units dialog box In each unit category, type the first letter of a

unit or constant. See Chapter 4 for more

information.

Dialog boxes with entry

fields

These include, but are not limited to: Create

New Folder, Rename, and Save Copy As. See

page 35 for more information about dialog

boxes.

Alpha-lock is not turned on in dialog boxes that require numeric-

only entries. The dialog boxes that accept only numeric entries are:

Resize Matrix, Zoom Factors, and Table Setup.

Use the 2 ¿ menu to select from a variety of special

characters. For more information, refer to “Entering Special

Characters” in Chapter 18.

Typing Alphabetic

Characters …

(continued)

Automatic Alpha-

Lock in TI-89 Dialog

Boxes

Note: To type a number,

press

to turn alpha-

lock off. Press

2 ™

to resume typing

letters.

For Special

Characters