Section 4 Theory Of Operation; Introduction; Notebook Functional Overview - Texas Instruments Extensa 660 Series Maintenance Manual

4.1 Introduction

This section contains a general block diagram theory of operation description of the
Extensa 660 Series Notebook Computers.
Note: Various internal components may change on future models and
busses/bus speeds are subject to change.

4.2 Notebook Functional Overview

The Extensa 660 Series Notebooks consist of eight major functions or sections
including:
System Processor — implemented on the System Board Assembly
Memory Subsystem — implemented on the System Board Assembly
I/O Subsystem — implemented on the I/O Board
Keyboard Subsystem — implemented on the System Board Assembly and the
Keyboard Assemblies
Video Subsystem — implemented on the I/O Board, LED Board, and LCD
Display Panel
Sound Subsystem — implemented on the System Board Assembly.
Glidepad Mouse Subsystem — implemented on the Glidepad assembly and on
the System Board Assembly
Hard Disk Drive Subsystem — implemented on the System Board Assembly
and the Hard Disk Drive Assembly
Floppy Disk Drive Subsystem — implemented on the System Board and Floppy
Disk Drive Assembly
PCMCIA Controller and Sockets — implemented on the System Board
CD-ROM Subsystem — implemented on the System Board and the CD-ROM
Power Subsystem — implemented on the Power Supply Board, Inverter Board,
battery packs, and AC adapter
Theory of Operation
Theory of Operation 4-1
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