Chapter 2: Operating the Calculator 21
02OPERDOC TI
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89/TI
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92Plus: O
p
eratingthe TI
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89/TI
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92Plus (English) SusanGullord Revised:02/23/01 1:06 PM Printed:02/23/01 2:11 PM Page21 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 xñ+yñ,
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.