6
Chapter 2: The 68000 TI AMS Operating System Overview
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
Many operating system routines are available to the application as shown in
Figure 2.2. The address of the jump table, a table of Operating System entry
points and data structures, is stored in memory location 0xC8. Through the jump
table, applications, and ASM programs can access low-level device drivers, the
event manager, memory manager, symbol table manager, graphical user
interface library, computer algebra system, math package, and utility routines.
Low-Level Drivers: Power, LCD,
Ke
board, Link Port, Timer
Memor
Mana
er Math Packa
e
Gra
hical
User Interface
Librar
S
mbol Table
Mana
er
Com
uter
Al
ebra
S
stem
Jum
Table
Event
Mana
er
A
lications
Utilit
Routines
Figure 2.2: Application/OS Interface
TI
-
BASIC programming language provides ease of programming at the expense
of speed and control of every calculator feature. ASM programs are routines
written in C or 68000 assembly language, both of which give the software
developer much greater control over the calculator. ASM programs can be called
from TI
-
BASIC and executed from the Home screen author line.
ASM programs are generally small (
≤
8 K for AMS 2.03 and
≤
24 K for AMS 2.04)
and execute in RAM. They are intended to offer the same speed and efficient
hardware access as Flash applications but as subroutines called from TI
-
BASIC
instead of fully integrated applications.
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