Texas Instruments PLUS TI-89 - Manual (Page 38)

Chapter 2: Operating the Calculator 21
02OPER DOC TI-89/TI-92 Plus: Operating the TI-89/TI-92 Plus (English) Susan Gullord Revised: 02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 21 of 44
The letters x, y, z, and t are commonly used in algebraic expressions.
So that you can type them quickly, these letters are primary keys on
the
TI -89 keyboard.
X Y Z T
Other letters are available as the j function of another key,
similar to the 2 and ¥ modifiers described in the previous section.
For example:
´ A
=
To: On the TI . 89, press: On the TI . 92 Plus, press:
Type a single
lowercase
alpha
character. j and then the letter
key
(status line shows ) the letter key
Type a single
uppercase
alpha
character. ¤ and then the letter key
(status line shows
+)
¤ and then the letter key
(status line shows
+)
Type a space. j  (alpha function
of the · key) spacebar
Turn on
lowercase
alpha-lock. 2 ™
(status line shows
)
(no action needed)
Turn on
uppercase
ALPHA-lock. ¤ ™
(status line shows
)
2 ¢
Turn off alpha-
lock. j (turns off upper-
and lowercase lock) 2 ¢ (turns off
uppercase lock)
Entering Alphabetic Characters
Alphabetic characters are used in expressions such as x ñ +y ñ ,
to enter variable names (page 47), and in the Text Editor
(Chapter 18).
Entering a Letter
Character on the
TI-89
Typing Alphabetic
Characters on the
TI-89 / TI-92 Plus
Note: On the TI - 89 , you do
not need j or alpha-lock
to type x, y, z, or t. But you
must use
¤ or uppercase
ALPHA -lock for X, Y, Z, or T.
Note: On the TI - 89 , alpha-
lock is always turned off
when you change
applications, such as going
from the Text Editor to the
Home screen.
j [A] types an A,
which is the same
color as the
j key.
2 È types ´ , which
is the same color as
the 2 key.