HP 731179-151 User Manual
Non-volatile memory usage
Non Volatile
Memory Type
Memory Type
Amount
(Size)
(Size)
Does this
memory
store
customer
data?
memory
store
customer
data?
Does this
memory
retain
data when
power is
removed?
memory
retain
data when
power is
removed?
What is the
purpose of
this
memory?
purpose of
this
memory?
How is data input into
this memory?
this memory?
How is this memory
write protected?
write protected?
Real Time Clock
(RTC) battery
backed-up
CMOS
configuration
memory (CMOS)
(RTC) battery
backed-up
CMOS
configuration
memory (CMOS)
256 Bytes
No
Yes
Stores system
date and time
and limited
keyboard
controller data.
date and time
and limited
keyboard
controller data.
Using the F10 Setup utility
or changing the Microsoft®
Windows® date & time.
or changing the Microsoft®
Windows® date & time.
This memory is not write-
protected. HP
recommends password
protecting the F10 Setup
utility.
protected. HP
recommends password
protecting the F10 Setup
utility.
Controller (NIC)
EEPROM
EEPROM
64 Kbytes
(not customer
accessible)
(not customer
accessible)
No
Yes
Store NIC
configuration
and NIC
firmware.
configuration
and NIC
firmware.
Using a utility from the NIC
vendor that can be run from
DOS.
vendor that can be run from
DOS.
A utility is required to
write data to this
memory and is available
from NIC vendor.
Writing data to this
ROM in an
inappropriate manner
will render the NIC non-
functional.
write data to this
memory and is available
from NIC vendor.
Writing data to this
ROM in an
inappropriate manner
will render the NIC non-
functional.
Keyboard ROM
64 Kbytes
(not customer
accessible)
(not customer
accessible)
No
Yes
Stores
firmware code
(keyboard,
mouse, &
battery
management).
firmware code
(keyboard,
mouse, &
battery
management).
Programmed at the factory.
Code is updated when the
system BIOS is updated.
Code is updated when the
system BIOS is updated.
A utility is required for
writing data to this
memory and is available
on the HP website.
Writing data to this
ROM in an
inappropriate manner
can render the PC non-
functional.
writing data to this
memory and is available
on the HP website.
Writing data to this
ROM in an
inappropriate manner
can render the PC non-
functional.
DIMM Serial
Presence Detect
(SPD)
configuration
data
Presence Detect
(SPD)
configuration
data
256 Bytes
per memory
module, 128
Bytes
programmabl
e (not
customer
accessible)
per memory
module, 128
Bytes
programmabl
e (not
customer
accessible)
No
Yes
Stores memory
module
information.
module
information.
Programmed by the memory
vendor.
vendor.
Data cannot be written
to this memory when the
module is installed in a
PC. The specific write
protection method varies
by memory vendor.
to this memory when the
module is installed in a
PC. The specific write
protection method varies
by memory vendor.
System BIOS
4 to 5
MBytes
MBytes
Yes
Yes
Store system
BIOS code and
PC
configuration
data.
BIOS code and
PC
configuration
data.
System BIOS code is
programmed at the factory.
Code is updated when the
system BIOS is updated.
Configuration data and
settings are input using the
F10 setup utility or a custom
utility.
programmed at the factory.
Code is updated when the
system BIOS is updated.
Configuration data and
settings are input using the
F10 setup utility or a custom
utility.
A utility is required for
writing data to this
memory and is available
on the HP website.
Writing data to this
ROM in an
inappropriate manner
can render the PC non-
functional.
writing data to this
memory and is available
on the HP website.
Writing data to this
ROM in an
inappropriate manner
can render the PC non-
functional.
154
Chapter 14 Statement of Volatility