User Guide
Product System (PS)
Subject:
C2-201 Product Internal Engineering
Spec.
Part No.:
99.K4501.000
Rev.: 0
Doc. No.
99.K4501.000-C2-201-001
Project Code:
99.K4501.001
Component Part.
No.:
NA
Page 16 of 28
Model Name:
DHS5
Form No: BQY0-0B-003-32(031205)
16
Using the administration password to enter the Setup utility allows the user to access all the
configurable fields. Whereas using the user password only allows the user
to configure a limited number of fields.
DHS52also provides a H/W solution to reset or bypass password.
Secured data is kept in a non-volatile storage device (EEPROM). The entire data structure of
secured data in the non-volatile storage must be verified with a checksum calculation.
Others follow Third party BIOS’s Security specification.
Serial Number (S/N)
T The Serial Number string will be stored in the secured data area. The S/N will not be
displayed in BIOS SETUP menu. The S/N is an alphanumeric string of 24 bytes in length.
The rule of S/N is: P/N (10 bytes) + Year (1 bytes) + Week (2 bytes) + series No (5 bytes) +
model (6 bytes). The following is an example of the string representation of S/N:
99K0502T0131500001DHS52.
Model ID String (for SLP)
On BenQ System has a specific text string embedded in BIOS ROM F000:FFB0h. It will be
identified the model and BIOS version by diagnostic program and flash utility. The format
is as below:
System Meter
DHS52 should provide 3 bytes in CMOS and the default value is 0. It will auto count the
hour of usage when boot to OS. The format is Hour(2 bytes): Min(1 byte)
System cannot reset its value.
Debugging
Basic unit problem analysis will be provided through the use of POST and runtime
checkpoint codes output to I/O port 378h.
Auto Dim
The system will support an automatic dimming of the LCD backlight when the AC power
source is NOT available (running on battery power).
The user may always manually increase or decrease the brightness, including to full
maximum setting.
The current user setting of brightness (along with current power source) will be saved, and
the brightness setting will be restored to the user’s set level at the next boot or resume.
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B e n Q H u b