Reserved Symbols - Texas Instruments TI-89 Software Manual

Section 4: Linker
4.8.

Reserved Symbols

The Sierra Systems standard C libraries reserve several symbols to locate the
memory heap. The symbols heap_org and heap_len and the memory routines
that use them, such as malloc, are not supported by Texas Instruments.
However, they are still reserved names and must be avoided. See chapter
13. Memory Management in the TI-89 / TI-92 Plus Developers Guide for
information on the memory routines available on the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus Sierra C Assembler Reference Manual Not for Distribution
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Beta Version February 2, 2001