Texas Instruments TI-89, TI-92

380 Chapter 22: Linking and Upgrading

22LINK.DOC TI-89/TI-92 Plus: Linking and Upgrading (English) Susan Gullord Revised: 02/23/01 1:23 PM Printed: 02/23/01 2:20 PM Page 380 of 1822LINK.DOC TI-89/TI-92 Plus: Linking and Upgrading (English) Susan Gullord Revised: 02/23/01 1:23 PM Printed: 02/23/01 2:20 PM Page 380 of 18

All data is compatible between a TI-89 and TI-92 Plus, but some

programs written for one may not run the same on the other because

of differences in the calculators’ screen sizes and keyboards.

Compared to a TI-92, the TI-89 and TI-92 Plus:

¦ Have functions, instructions, and system variables that do not

exist on the TI-92.

¦ Can use the same variable to define and then evaluate a user-

defined function or program. For example, you can define a

function in terms of x and then evaluate that function using an

expression containing x. This causes a Circular definition error on

the TI-92. Refer to Chapter 17: Programming for more

information.

¦ Manage local variables differently than the TI-92. Refer to

Chapter 17: Programming for more information.

When you create a function or program in the Program Editor, it

exists in text form until you run it. Then it is converted automatically

to a tokenized form.

¦ Data in text form can always be shared between a TI-89,

TI-92 Plus, and TI-92. However, the function or program may not

give the same results when run on a different calculator.

¦ Data in tokenized form contains information that describes

included functionality. The TI-89 and TI-92 Plus use the same

tokenized forms, but the TI-92 is different.

− If you attempt to send a tokenized function, program, or other

data type from a TI-89 or TI-92 Plus to a TI-92, the TI-89 or

TI-92 Plus automatically checks to be sure the functionality is

acceptable for the TI-92. If not, the data is not sent. This is for

your protection because the tokenized data could cause the

TI-92 to lock up if the data is sent with invalid functionality.

− Even if the tokenized data is sent, this does not guarantee that

the data will give the same results on the other calculator.

Compatibility between a TI-89, TI-92 Plus, and TI-92

In general, TI-89 and TI-92 Plus data and programs are

compatible, with some differences. However, both calculators

have incompatibilities with the TI-92. Where possible, data

transfer with a TI-92 is allowed.

Main Types of

Incompatibilities

Text versus

Tokenized

Note: If you use the

Program Editor to edit a

function or program that is i

tokenized form, it returns to

text form until the next time

ou run it.