Internal Keyboard - Compaq Armada e500 Series Reference Manual

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chapter
The internal keyboard for the Armada E500 and Armada V300 computers consists of a
keyboard matrix with a keyboard controller integrated into the MSIO Super I/O
Controller, a TouchPad, or stickpoint pointing device (depending on computer model)
and select buttons. The computers and optional convenience base have a connector for
an external full-sized keyboard and external mouse.
The keyboard used with the Armada E500 and Armada V300 computers is designed to
allow for both TouchPad and EasyPoint pointing devices. Electrically the keyboard
emulates a standard 101-key keyboard.
The TouchPad is the Synaptics TouchPad module. It is an input-pointing device that
detects the position of a finger over a touch-sensitive area. To move the cursor, the user
lightly slides a finger over the smooth sensor area. To select a screen icon, the user
gently taps the surface of the TouchPad.
The TouchPad is a capacitive sensor. The user's finger is detected by measuring its
effect on an array of capacitive lines integrated into the PC board. The pad senses both
the finger's position and its contact area (X, Y, Z). The area of contact is a measure of
applied pressure by the user.
One side of the module PC board is the sensor surface, which is a sensitive area
protected by a layer of smooth durable Mylar. The other side of the PC board is used for
electrical components.
The TouchPad communicates with the system through a standard PS/2 interface and is
fully compatible with the standard Microsoft mouse driver. The module connector
includes the PS/2 signal pins, power supply pins, and two connections for external
mouse buttons.