1-12 Product Description
1.4 Design Overview
This section presents a design overview of the computer. The overview is limited to
field replaceable parts. All replacement parts are listed in Chapter 3.
1.4.1 System Unit
The computer is a traditional clamshell design with a display assembly attached to a
system unit. The computer opens to reveal a backlit LCD display and a full-function
keyboard. The display is designed for a continuously adjustable tilt angle.
1.4.2 Internal Boards
The system electronics are integrated on four printed circuit assemblies: the audio/led
board, system board, modem board, and the DC-DC converter board.
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The audio/led board provides support for the audio functions.
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The system board integrates the processor, on-board memory, level 2 cache, local
bus video adapter, and PCMCIA/CardBus adapter.
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The optional modem board supports data or fax functions.
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The DC-DC converter board creates the system voltages (3.3v and 5v) from the
battery or AC/DC input.
Processor
An Intel Mobile Pentium II processor is located on the system board for the 233 MHz
and 266 MHz models.
Memory
Base memory is 32-MB with 16-, 32-, 64-, or 128-MB of optional expansion memory.
Base memory is onboard memory built into the system board. Expansion memory
consists of one memory expansion board available as a user installable option.
Cache
Level 2 cache is integrated in the CPU module. It is not user upgradable.
PCMCIA/CardBus and Video Adapter Controller
The PCMCIA/CardBus adapter is based on the Texas Instrument PCI1220 PC to
CardBus controller unit. The local bus video adapter is the Chips and Technologies
65555 controller.
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The serial-parallel port board expands the serial and parallel signals from the system
board to the serial and parallel expansion connectors.
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The audio/led board supports the microphone and headphone jacks, the volume
control switches, and the amplifier and equalization circuitry.
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