Chapter 2: TI-83 Plus Specific Information 11
TI-83 Plus Developer Guide Third Release May 28, 2002
Swap Area/User APPS/Data Area
This area is dynamically allocated for use by the system as needed in the space
indicated in Fig. 2.5 and 2.5b.
System Development Environment
All TI-83 Plus applications are developed in Z80 assembly language. Chapter 3 contains
more specific information and examples. This section provides in-depth information
about the use of System RAM, User RAM, Floating Point Stack, etc. (see Fig. 2.4).
System Routines
Entry points for a set of TI-83 Plus system routines are provided in the TI-83 Plus
System Routine Documentation (separate document). A list of entry point equated
labels is provided in the file, TI83plus.inc. Later in this chapter, source code examples
are included with detailed explanations of how to access system routines.
To access these system routines use the Z80 RST instruction. Two macro-instructions
(macro) are provided for simplification. Each of these macros uses three bytes of code
space.
If your assembler does not support macro calls, substitute:
B_CALL label
with
RST rBR_CALL
DW label
B_JUMP label
with
CALL BRT_JUMP0
DW label
The following section is a detailed explanation of the various RAM areas shown in
Fig. 2.4.
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