Texas Instruments TI89 Developer Guide - Page 187
Data Types, The TI AMS Operating System OS supports the following data types
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14. 145 Data Types The TI AMS Operating System (OS) supports the following data types: • Expressions • Lists • Matrices • Data Variables • Text Variables • Strings • Graph Databases • Pictures • Programs • Functions • Assembly Programs • Third Party Data Types (FILEs) Note that there are two additional data types: figures and macros. They are only supported by the, at one time, built-in geometry application which is now a separate application. This chapter defines the structure of the data objects that may appear in each of the above data types. These data objects all have an embedded tag value which is always the last value stored in a data object. The first word (Most Significant Byte first) of every data object is the length of the object. This length does not include itself, so to find the tag associated with any object, add the length of the object to the starting address of the object plus one. There is a routine, HToESI, that given the handle of a data object will return a pointer to the tag byte for that object. Shown below is a list of the data tag values along with other associated tags (END_TAG, COMMAND_TAG, END_OF_SEGMENT). TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001
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