Texas Instruments TI89 Developer Guide - Page 263

221 Glossary Aggregate AMS apps ASCIIZ ASM bignum Dirty estack expression stack external form Freeware Garbage collection Either a list or a matrix. Advanced Mathematics Software. Downloadable Flash applications. American Standard Code for Information Interchange Zero  a convention for encoding characters and numerals in a seven or eight-bit binary number which is terminated with a zero byte. Assembly-language program. Another name for the rational number system that includes tagged integers and tagged fractions. All equations and the variables referenced by those equations are monitored after a graph is complete. If any of the equations or referenced variables changes, the graph is marked as "dirty" so that the next time the user views the graph it is regraphed. An abbreviation for expression stack. A generalized stack defined as an array of Quantums. The tokenizer and simplifier use this stack to perform their tasks. The tokenized Polish representation produced by the parser and provided to the 1D and 2D display procedures. External form is a contiguous representation consisting of tagged constants, variables, unary tags on top of one expression, binary tags on top of two expressions, or other tags on top of a tail. External form has a direct correspondence to the 1D input and output. Programs or databases that an individual may use without payment of money to the author. Commonly, the author will copyright the work as a way of legally insisting that no one change it prior to getting approval. Commonly, the author will issue a license defining the terms under which the copyrighted program may be used. With freeware, there is no charge for the license. A procedure that automatically determines what memory is no longer being used and recycles it for other use. This is also known as heap compression. TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001