Compal ACY25 series, Service Manual

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Chapter 2-36
“ 7“,” 8“,” 9“,” 0“,” U”,” I”,” O”,” P”,” J”,” K”,” L”,” ;”,” M”,” .”,” /”.
Other Fn key
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Scroll lock :press Fn + F12
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Numeric keypad lock: Fn + F11
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Pad lock: Fn + F10
Two host interface channels support
Keyboard and mouse interface transfer port
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One channel is dedicated for the keyboard and mouse data transfer(host address 60h and
64h). The Keyboard and Mouse channel of KBC is compatible to the legacy 8042 host
interface. It is base on two registers: Command/Data and Status
•
The KB-BIOS interrupt generates IRQ1(Keyboard) and IRQ12(Mouse) for system.
Power management interface transfer port
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The other for the power management function(host address 62h and 66h). The Power
Management channel of KBC structure and operation are similar to those of the
Keyboard/Mouse channel.
Support three independent devices
•
The KBC provides three data transfer channels. Each channel has two quasi-bidirectional
signals that are used for the direct interface to an external keyboard, mouse or any other
PS/2 compatible pointing device.
•
The three channels are identical and thus allow the connector ports to be interchangeable.
Devices PnP configuration
Hot Plug-and-Play support
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The KBC watches both external devices, checking if the devices have recently been
plugged in or unplugged. The Hot pluggability of external PS2 devices feature detects the
attachment or removal of these devices.
Hot swapping control
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When the device is plugged in, the software automatically initializes the state of that
device, checks port swapping, and setup the KBC to handle dual-device operation. In dual-
device operation, the internal device is set in the same state as external device. When the
external device is unplugged, the internal device becomes the primary device.
ACPI EC interface Specification support
ACPI interface support
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The KBC provides support for Advance Configuration and Power Interface
specification(ACPI) Embedded Controller interface.
EC command support
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The 2nd (Power Management) host interface channel of the KBC is dedicated to this
function.
•
All EC commands defined in the ACPI specification - Read/Write, Burst Mode
enable/disable and Query command - are supported.