Texas Instruments TI-89 Tip List page 460

cursor pad See cursor keys
cut, copy, paste
Calculator text editing features. Cut removes the marked expression and places a copy in the
clipboard. Copy places a copy of the marked expression in the clipboard. Paste inserts the clipboard
contents at the cursor location.
Data/Matrix Editor
The application built into the calculator which is used to create or edit data variables, matrices and lists.
It is accessed with the [APPS] key.
DBus
The name of the GraphLink serial link as described in the SDK manual. So named because the data
lines are labeled D0 and D1?
Derive
A trade name for a PC-based computer algebra system, from which the TI-89 / TI-92 Plus CAS was
derived. TI now owns Derive and continues to sell it.
DG
Acronym for discussion group.
discussion group
An electronic messaging system provided for users by TI on their web site. Discussion groups are
similar to Usenet news groups, but the TI discussion groups are moderated by TI to remove trolls,
vulgarity and profanity, and offers to buy or sell. There are dozens of TI discussion groups, focusing on
different calculators and fields of study.
ebay
Abbreviation for the web auction site www.ebay.com. An inconvenient way to buy used calculators at
prices near those of brand new units.
emulator
An emulator is software that runs on a PC which simulates the operation of the calculator, including
running programs. Only one third-party emulator, called VTI, is available. To use the emulator, you
must have a calculator ROM image on the PC. You violate TI copyrights if you use a ROM image with
the emulator and you do not actually own the calculator.
entry line
The line at the bottom of the calculator display where commands and instructions are entered.
EOS; EOS hierarchy
A TI acronym for Equation Operating System. The EOS specifies the order in which operators are
applied. The TI-89 / TI-92 Plus Guidebook specifies the EOS hierarchy in Appendix B. Note that
exponentiation is applied before negation, and that logical operators (and, or, etc.) are also prioritized.
Exact mode See auto, exact, approx modes
Equation Writer See EQW.
EQW
Acronym for equation writer. An equation writer is a program which enables you to enter expressions in
Pretty Print format, in contrast to the usual command line format. This is similar to the equation editors
in MS Word, or WordPerfect, but calculator equation writers actually perform math. A programmer who
14 - 6