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Chapter 3: The TI-89 / TI-92 Plus Hardware Overview
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
•
A black and white LCD display (100 lines of 160 pixels for the TI-89, 128 lines
of 240 pixels for the TI-92 Plus).
•
A set-line / scan-line style matrix keyboard.
•
A three line (D0, D1, and ground) serial IO interface.
This chapter describes in some detail the locations that an application may need
to access in order to accomplish a task. For the most part, interaction with the
hardware can be accomplished through the use of specific entry points. To
remain compatible with other applications and future revisions of the OS, the
developer should utilize entry points wherever possible.
3.2. Memory Map
Memory for the calculators consists of RAM memory, Flash memory, and
address space within the ASIC. Memory is limited and optimization is important
when developing for these platforms. Additionally, since Flash memory stores the
OS, certificates, applications, and does not have infinite life, more restrictions are
placed on its use.
The OS handles all memory allocation through the heap or file system. See
chapter
13. Memory Management
. For reference, the memory map is shown in
Table 3.1.
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