7
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
3. The TI-89 / TI-92 Plus Hardware Overview
3.1. Overview
The TI-89 and TI-92 Plus Graphing calculators provide a platform for writing
interactive applications that utilize input, processing, storage, communication,
and presentation. When creating applications, understanding the capabilities and
limitations of the platform are important to creating a good interface to the user.
Pictured below is a block diagram of the TI
-
89 / TI
-
92 Plus from a programmer’s
perspective.
68000
Central Processing Unit
Application Specific
Integrated Circuit
(ASIC)
Random Access
Memory (RAM)
Flash
Read Only Memory (ROM)
Liquid Crystal Display
(LCD)
Keyboard
Dbus Serial Input/Output
68000
Central Processing Unit
Application Specific
Integrated Circuit
(ASIC)
Random Access
Memory (RAM)
Flash
Read Only Memory (ROM)
Liquid Crystal Display
(LCD)
Keyboard
Dbus Serial Input/Output
Figure 3.1: System Block Diagram
From the block diagram, the specific details of the components are:
•
An ASIC, which contains all of the “glue logic” that allows the different
components to communicate with each other, as well as specialized registers
for system control.
•
A Motorola 68000 CPU.
•
256 K bytes of RAM.
•
2 MB bytes of Flash ROM.
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