HP OmniBook 4100/4150 Product Information 1-15
Table 1-13. Functional Structure
Bootup
CPU module
Motherboard
BIOS IC
Floppy disk module
Hard disk drive
Main processor (MMO).
Primary system circuitry.
Code for basic system functions (part of motherboard on OB 4150).
First source of disk-based startup code.
Second source of disk-based startup code.
Processor
CPU module
Motherboard
Main processor, numeric data processor, L1 and L2 cache.
Primary system circuitry.
Memory
Motherboard
RAM board
VGA PCA
No onboard RAM (OB 4150), or first 32 MB of RAM (OB 4100).
Changeable RAM (1 slot on OB 4100, 2 slots on OB 4150).
Video RAM.
Power
Battery
Motherboard
DC-DC PCA
AC adapter
Power storage.
AC adapter socket, power switch, lid switch, system-off switch, power
supply.
Power control circuitry.
AC-to-dc converter.
Display
Motherboard
LCD module
Inverter PCA
LVDS PCA
VGA PCA
PCMCIA/zoomed video controller.
Display output, backlight.
Power converter for backlight.
Display drivers, LVDS processing (OB 4100/4150†).
Display/graphics controller, video RAM (OB 4150B: LVDS processing).
Hard disk
Motherboard
Hard disk drive
Hard disk controller.
Hard disk mechanism.
Floppy drive
Motherboard
Floppy disk module
I/O controller, floppy connector.
Floppy disk mechanism.
Keyboard
Motherboard
BIOS IC
Keyboard
Keyboard controller.
Keyboard BIOS (part of motherboard on OB 4150).
Key switches.
Pointer
Motherboard
BIOS IC
Keyboard
Top case
Keyboard controller, pointing stick controller (PS/2 output).
Keyboard BIOS (part of motherboard on OB 4150).
Pointing stick sensor.
Touch pad sensor, controller (PS/2 output).
Audio
Motherboard
VGA PCA
Audio jack PCA
Inverter PCA
Speakers
Audio controller (OB 4100/4150B), audio decoder, speaker amplifier,
headphone amplifier, zoomed video controller, mute switch.
Audio controller (OB 4150†).
External audio jacks.
Microphone.
Speakers.
Status
Motherboard
LED strip cable
VGA PCA
Keyboard controller, plus keyboard LEDs (OB 4150).
Main LEDs.
Keyboard LEDs (OB 4100).
Serial
Motherboard I/O controller, serial connector.
Parallel
Motherboard I/O controller, parallel connector.
Infrared
Motherboard
IR PCA
I/O controller.
Infrared transmitter/receiver.
PS/2 port
Motherboard Keyboard controller, PS/2 connector.
USB
Motherboard Bus controller (South Bridge), USB connector.
Docking port
Motherboard Docking logic, docking connector.
PCMCIA
Motherboard
PCMCIA socket
PCMCIA controller.
PCMCIA connectors.
† Models called 4150† in this manual have no marking in the serial number, whereas models called 4150B
have 4150 B after the serial number.
