programs and functions can also read the contents of global variables. See also local variable.
GraphLink; GraphLink cable
'GraphLink' can refer either to the physical cable that connects the calculator and the PC (or two
calculators), or the software that runs on the PC. The GraphLink cables are not free; the GraphLink
software is free and can be obtained from the TI web site. The GraphLink cable is not the same as the
unit-to-unit cable included when the calculator is purchased.
There are four different versions of the GraphLink cable: the gray GraphLink, the black GraphLink, the
USB GraphLink, and third-party cables. The gray GraphLink was the original cable. The black
GraphLink is the new cable, and it can transfer data much faster than the gray cable. The USB cable is
only available for Apple computers.
The GraphLink software is available for IBM-compatible PCs and Apple computers. The purpose of the
software is to transfer variables and programs between the calculator and the PC. GraphLink software
can also be used to back-up and restore the calculator's memory, and to edit TI Basic source code.
The GraphLink connector is the small round connector on the calculator into which the GraphLink
cable is plugged.
graph screen
The screen on which function graphs and data plots are shown.
group file
Calculator files which have been combined into one file with the GraphLink software.
hand key
The TI-92 Plus has the hand key; the TI-89 does not. It is located above function key [F5]. It is used
with [UP] and [DOWN] to scroll large expressions.
hardware version See HW1, HW2.
hexadecimal, hex
Refers to numbers expressed in the base-16 number system. The TI-89 / TI-92 Plus can represent
integers in base-10 (decimal), base-2 (binary) and hexadecimal.
history, history display, history area
The area of the home screen in which previous calculations are results are shown. The history display
is directly above the entry line.
home screen
The default display screen on which calculations and commands are entered, and calculated results
are shown. The home screen is one of several display screens used by the calculator. Other screens
are the graph screen and the program I/O screen. The home screen is displayed by pressing [HOME]
if some other screen is currently shown.
HW1, HW2
Acronyms for hardware version 1 and hardware version 2. The original TI-89 and TI-92 were built with
HW1. More recent TI89s and the TI92+ are built with HW2. HW1 TI-89s are hard to find now. HW2
calculators run about 20% faster than HW1 calculators. HW2 calculators have different display driver
hardware that also improves performance. HW2 calculators also have built-in hardware which TI uses
to enforce the ASM limit.
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