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Table 1-9. Functional Structure
Function Components Used Component Roles
Bootup
Motherboard
Hard disk drive
Removable device
Main processor, primary system circuitry.
First source of disk-based startup code.
Second source of disk-based startup code.
Processor
Motherboard Main processor, numeric data processor, L1 and L2 cache, primary system
circuitry.
Memory
Motherboard
SDRAM modules
Video RAM.
Changeable SDRAM (2 slots).
Power
Main battery
Motherboard
Switchboard PCA
Backup battery
CMOS battery
Expansion base
AC adapter
Power storage.
AC adapter socket, power switch, lid switch, system-off switch, power supply,
power control circuitry.
Sleep switch.
Provides short-term power to maintain memory while swapping main battery.
Maintains system data stored in CMOS RAM.
AC adapter socket, system-off switch, power supply, power control circuitry.
AC-to-DC converter.
Display
Motherboard
Display assembly
PCMCIA/Zoomed Video controller, display drivers, LVDS processing,
display/graphics controller, video RAM.
Display output, backlight, power converter for backlight.
Hard disk
Motherboard
HDD/LED flex cable
Hard disk drive
Hard disk controller.
Hard disk signal pass-through.
Hard disk mechanism.
Keyboard
Motherboard
Keyboard
Switchboard PCA
Keyboard BIOS, keyboard controller.
Key switches.
One-Touch switches.
Pointer
Motherboard
Keyboard
Top case
Keyboard BIOS, pointing stick controller (PS/2 output), keyboard controller.
Pointing stick sensor.
Click buttons, scroll button.
Audio
Motherboard
Bottom case
Expansion base
Audio controller, audio decoder, speaker amplifier, Zoomed Video controller,
microphone, external audio jacks, headphone amplifier, audio-off switch.
Speaker.
CD player, audio circuitry, speakers.
Status
Motherboard
Switchboard PCA
HDD/LED flex cable
Top case
Expansion base
LED circuitry, keyboard controller.
Keyboard LEDs.
Main status LEDs.
Audio-off LED.
Status panel.
Serial
Motherboard
Expansion base
I/O controller.
Serial connector.
Parallel
Motherboard
Expansion base
I/O controller.
Parallel connector.
Infrared
Motherboard I/O controller, infrared transmitter/receiver.
Wireless
Display assembly
Motherboard
Switchboard PCA
Radio PCA, circuitry, and antennas, on-off button, and indicator light.
I/O controller.
Power/signal pass-through.
PS/2 ports
Motherboard
Expansion base
Keyboard controller.
PS/2 connectors.
USB
Motherboard
Expansion base
Bus controller (South Bridge), USB connectors, overload switch.
USB connectors, overload switch.
Docking
Motherboard
Expansion base
Docking logic, docking connector.
Docking connector, undock switch, emergency undock latch.
PC Card
Motherboard PC Card controller, PC Card connector.