Lenovo ThinkPad 600E Technical Reference Manual for the ThinkPad 600 - Page 53

Power-On Password, Other Passwords, Easy-Setup, IBM Personal System/2 Hardware Interface Technical

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Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 If set to 1, this bit indicates that a channel check has occurred. If read, this bit indicates the condition of the timer/counter 2 'output' signal. If read, this bit toggles for each refresh request. If set to 0, this bit enables the channel check. This bit is set to 1 during a power-on reset. If set to 0, this bit enables the PCI SERR#. If set to 1, this bit enables the speaker data. If set to 1, this bit enables the timer 2 gate. Power-On Password RT/CMOS RAM has 8 bytes reserved for the power-on password and the check character. The 8 bytes are initialized to hex 00. The microprocessor can access these bytes only during POST. After POST is completed, if a power-on password is installed, the password bytes are locked and cannot be accessed by any program. During power-on password installation, the password (1 to 7 characters) is stored in the security space. Installing the password is a function of the built-in system program Easy-Setup. The power-on password does not appear on the screen when it is installed, changed, or removed. After the power-on password has been installed, it can be changed or removed only during POST. The computer also can have a keyboard password. For more information, see the keyboard and auxiliary device controller section of the IBM Personal System/2 Hardware Interface Technical Reference. Other Passwords In addition to the power-on password, the computer provides two more passwords: The hard-disk password (HDP) protects the data on your removable hard disk drive from being accessed by unauthorized persons. System Board 2-31

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Bit 6
If set to 1, this bit indicates that a channel check has
occurred.
Bit 5
If read, this bit indicates the condition of the timer/counter
2 ‘output’ signal.
Bit 4
If read, this bit toggles for each refresh request.
Bit 3
If set to 0, this bit enables the channel check.
This bit is
set to 1 during a power-on reset.
Bit 2
If set to 0, this bit enables the PCI SERR#.
Bit 1
If set to 1, this bit enables the speaker data.
Bit 0
If set to 1, this bit enables the timer 2 gate.
Power-On Password
RT/CMOS RAM has 8 bytes reserved for the power-on password
and the check character.
The 8 bytes are initialized to hex 00.
The
microprocessor can access these bytes only during POST.
After
POST is completed, if a power-on password is installed, the
password bytes are locked and cannot be accessed by any program.
During power-on password installation, the password (1 to 7
characters) is stored in the security space.
Installing the password is a function of the built-in system program
Easy-Setup
.
The power-on password does not appear on the screen
when it is installed, changed, or removed.
After the power-on
password has been installed, it can be changed or removed only
during POST.
The computer also can have a keyboard password.
For more
information, see the keyboard and auxiliary device controller section
of the
IBM Personal System/2 Hardware Interface Technical
Reference
.
Other Passwords
In addition to the power-on password, the computer provides two
more passwords:
The
hard-disk password
(HDP) protects the data on your
removable hard disk drive from being accessed by unauthorized
persons.
System Board
2-31