Texas Instruments TI-83 Plus Manual page 171

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Marked Dirty The graph is marked as needing to be updated. The next system routine
that will affect the graph contents will cause the system to regraph all of the
equations selected thereby making the graph clean.
Memory Memory is where data is stored. On the TI 83 Plus, the main memory is the
built-in 32K of RAM. This memory is composed of one-byte sections, each
with a unique address.
Microprocessor See processor.
Operating The software included with every new calculator. OS contains the features
System (OS) that are of interest to customers, as well as behind-the-scenes functionality
that allows the calculator to operate and communicate. In our newer
calculators, the OS is in Flash ROM, so the user can electronically upgrade
it with OS.
Processor A large computer chip that does most of the work in a computer or
calculator. The processor in the TI 83 Plus is the Zilog Z80 chip.
Program A program is a list of instructions written in sequential order for the
processor to execute.
Program ID An ID number assigned to a particular software program. It is used during
number the program authentication process to match the program licenses in a
unit/group certificate to the program being downloaded into the calculator.
Program A digital license purchased by a customer allowing the customer to authorize
license the download/execution of a particular software program to a specific
calculator. The program licenses are assigned to and listed in the calculator
unit/group certificates.
Register
A register is high-speed memory typically located directly on the processor.
It is used to store data while the processor manipulates it. On the TI 83 Plus
there are 14 registers.
Register pair Two registers being used as if they were one, creating a 16-bit register.
Larger numbers can be used in registered pairs than in single registers. The
register pairs are AF, BC, DE, and HL. Register pairs are often used to hold
addresses.
Run (Busy) When the TI 83 Plus is calculating or graphing, a vertical moving line is
Indicator displayed as a busy indicator in the top-right corner of the screen. When you
pause a graph or a program, the busy indicator becomes a vertical moving
dotted line.
SDK Software Development Kit a set of tools that allow developers to write
software for specific platforms.
Shareware Sometimes called User Supported or Try Before You Buy software.
Shareware is not a particular kind of software, it is a way of marketing
software. Users are permitted to try the software on their own computer
systems (generally for a limited period of time) without any cost of obligation.
Payment is required if the user has found the software to be useful or if the
user wishes to continue using the software beyond the evaluation (trial)
period.
TI 83 Plus Developer Guide
Glossary
Third Release May 28, 2002