HP EliteBook Revolve 810 EliteBook Revolve 810 G3 Maintenance and Service Guid - Page 107

Non-volatile memory usage, Non Volatile

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Non-volatile memory usage Non Volatile Memory Type Amount (Size) Real Time Clock (RTC) battery backed-up CMOS configuration memory (CMOS) 256 Bytes Controller (NIC) EEPROM 64 KBytes (not customer accessible) Keyboard ROM 64 KBytes (not customer accessible) DIMM Serial Presence Detect (SPD) configuration data 256 Bytes per memory module, 128 Bytes programmable (not customer accessible) System BIOS 4 to 5 MBytes Does this memory store customer data? Does this memory retain data when power is removed? No Yes No Yes No Yes No Yes Yes Yes What is the purpose of this memory? How is data input into this memory? How is this memory write protected? Stores system date and time and limited keyboard controller data. Using the F10 Setup utility or changing the Microsoft Windows date and time. This memory is not writeprotected. HP recommends password protecting the F10 Setup utility. Store NIC configuration and NIC firmware. Using a utility from the NIC 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 nonfunctional. Stores firmware code (keyboard, mouse, & battery management). Programmed at the factory. 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 nonfunctional. Stores memory module information. Programmed by the memory 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. Store system 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 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 Non-volatile memory usage 97

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Non-volatile memory usage
Non Volatile
Memory Type
Amount (Size)
Does this
memory store
customer data?
Does this
memory retain
data when
power is
removed?
What is the
purpose of this
memory?
How is data
input into this
memory?
How is this
memory write
protected?
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
256 Bytes
No
Yes
Stores system
date and time
and limited
keyboard
controller data.
Using the
F10
Setup utility or
changing the
Microsoft
Windows date
and time.
This memory is
not write-
protected. HP
recommends
password
protecting the
F10
Setup
utility.
Controller (NIC)
EEPROM
64 KBytes (not
customer
accessible)
No
Yes
Store NIC
configuration
and NIC
firmware.
Using a utility
from the NIC
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
nonfunctional.
Keyboard ROM
64 KBytes (not
customer
accessible)
No
Yes
Stores firmware
code (keyboard,
mouse, &
battery
management).
Programmed at
the factory.
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
nonfunctional.
DIMM Serial
Presence Detect
(SPD)
configuration
data
256 Bytes per
memory
module, 128
Bytes
programmable
(not customer
accessible)
No
Yes
Stores memory
module
information.
Programmed by
the memory
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.
System BIOS
4 to 5 MBytes
Yes
Yes
Store system
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
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
Non-volatile memory usage
97