ROM
1) The integrated circuit (microchip) on which the calculator operating system (AMS) is stored. ROM is
an acronym for Read-Only Memory. The TI-89 and TI-92 Plus use flash ROM. 2) The calculator
operating system itself, as in the ROM version.
ROM version
A number which specifies the version of the calculator operating system software. Changes are made
to the OS software over the product life of the calculator, and the ROM version number identifies the
particular version on a given calculator. The OS changes may include added features or functionality,
bug fixes, or software changes to comply with hardware changes. Assembly programs must often be
rewritten to accommodate a new ROM version. The ROM version can be displayed by pressing [F1] at
the home screen, then [A] About. The ROM version is specified as "Advanced Mathematics Software
Version xxx", where "xxx" is the ROM version number. Also see AMS.
routine
A general term which refers to programs, functions and commands. Routines may be built-in to the
calculator, or may also be written in assembly, TI Basic or C.
RPN
An acronym for Reverse Polish Notation. This is a calculator operating method in which the expression
operands are entered on a stack, then operations are performed on the stack elements.
Hewlett-Packard calculators use RPN; TI calculators do not. Independent programmers have written
RPN interfaces for the TI-89 / TI-92 Plus. RPN is more keystroke-efficient than other interface
methods; complicated expressions can be entered in fewer keystrokes without parentheses. More
description of RPN can be found at the HP Museum calculator site (http://www.hpmuseum.org/).
scroll
To move the display contents so that hidden parts of an expression are shown. Long or large
expressions will not fit in the small calculator display, and you need to scroll the expression to see all of
it.
SDK
Acronym for Software Development Kit. The SDK is a combination of software and documentation with
which you can write applications for the TI-89 / TI-92 Plus. The software consists of a C compiler and
assembler. Flash applications can only be developed with the SDK. The SDK is available from TI in
two versions; one version is free. With the free version, you cannot create flash applications.
self-test
Software built into the calculator to test operation during manufacturing or repair. While the self-test
software is not documented by TI, some user have discovered certain parts of it. The self-test usually
results in reset memory.
serial port
The RS232 serial port on a computer. This is not a USB port. One version of the GraphLink cable is
compatible with serial ports.
shell
An alternative operating environment which supports assembly programs. Shells are not developed or
supported by TI. Shells were originally needed to run assembly programs on the TI-89 and TI-92 Plus.
Assembly programs which are properly coded do not need shells; see no-stub. A shell is essentially an
assembly program used to run other assembly programs.
signing
The process by which TI turns a program into an application which runs on the calculator.
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