Theory of Operation 4-1
4
Theory of Operation
4.1 Introduction
This section contains a general block diagram theory of operation description of the
Extensa 60x/65x 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 60x/65x Series Notebooks consist of eight major functions or sections
including:
♦ System Processor - implemented on the Motherboard Assembly
♦ Memory Subsystem - implemented on the Motherboard Assembly
♦ Processor/Memory/I/O Control - implemented on the Motherboard
Assembly
♦ Keyboard Subsystem - implemented on the Motherboard and the Keyboard
Assemblies
♦ Video Subsystem - implemented on the Top Board and on the LCD Display
Assembly
♦ Sound Subsystem - implemented on the Motherboard Assembly.
♦ Touchpad Mouse Subsystem- implemented on the Touchpad assembly and
on the Motherboard Assembly
♦ Hard Disk Drive Subsystem - implemented on the Motherboard Assembly
and the Hard Disk Drive Assembly
♦ Floppy Disk Drive Subsystem - implemented on the Motherboard and Floppy
Disk Drive Assembly
♦ Power Subsystem - implemented on the Power Supply Board, Inverter Board,
battery packs, and AC adapter
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