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2-4
2.2.7 Video Graphics Adapter
2.2.8 Video BIOS ROM
2.3 Power supply
2.3.1 Power low indication.
2.3.2 Recharging a battery
Remark:
CS 55 801
2.3.3 Power conservation.
The Notebook offers numerous power conservation features
in order to prolong battery life to the maximum.
*
Intelligent power saving
This feature is automatic and requires no control from the
user. It is functional at all times on battery power.
1. A slower rate of DRAM refresh is used.
2. The FDD will be monitered wether the drive is being
used. If not the FDD controller will be shut down. Any
instruction which requires access to the drive, the
FDD controller will automatically be "woken up".
3. The CPU monitors its own activity. If no operation is ta-
king place, the PCU is slowered down from the 16Mhz
or 8Mhz rate to 4Mhz.
When CPU activity is resumed, the clock speed is auto-
matically returned to the original speed.
This feature will be overridden if the "Auto-standby
disable" option in the Setup utility is selected.
* Selectable power down.
This feature is encountered in the Setup utility.
For a preset "trip time" which is specified in the Setup uti-
lity the system can be instructed to shut down power con-
suming components.
1. Backlight power off:
Screen backlight is powered down if the LCD power
down time elapses with no srceen activity and no key
stroke.
2. LCD screen power off:
LCD screen is powered down if the LCD power down
time elapses with no srceen activity and no key stroke.
3. HDD power down:
The HDD power is shut down if the HDD power down
time elapses with no hard disk activity.
2.3.4 Stanby Mode
Standby mode is only available, and necessary, when batte-
ry power is used. In this node the amount of power required
by the system is greatly reduced.
Standby mode can be entered in two ways:
*
Press the Standby mode switch.
*
Closing the LCD cover without turning off the power.
In this case a warning beep will sound to indicate that the
power has not been sitched off.
The techniques used to conserve power in standby mode
are listed below.
*
The clock speed is reduced to 4Mhz.
The HDD is powered down.
Screen backlighting is switched off.
The LCD screen is switched off.
The LCD controiler is powered down
Floppy disk controller is powered down.
Keyboard LEDs are turned off.
+ * + © &
When the system is in standby mode, the CHR/STB LED
will flash to alert the system condition.
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