HP EliteBook 720 G1 Maintenance And Service Manual page 167

Non Volatile Amount (Size)
Memory Type
Real Time Clock 256 Bytes
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
Controller (NIC) 64 KBytes (not
EEPROM customer
accessible)
Keyboard ROM 64 KBytes (not
customer
accessible)
DIMM Serial 256 Bytes per
Presence Detect memory
(SPD) module, 128
configuration Bytes
data programmable
(not customer
accessible)
System BIOS 4 to 5 MBytes
Does this Does this
memory store memory retain
customer data? data when
power is
removed?
No Yes
No Yes
No Yes
No Yes
Yes Yes
What is the How is data
purpose of this input into this
memory? memory?
Stores system Using the F10
date and time Setup utility or
and limited changing the
keyboard Microsoft
controller data. Windows date
and time.
Store NIC Using a utility
configuration from the NIC
and NIC vendor that can
firmware. be run from DOS.
Stores firmware Programmed at
code (keyboard, the factory.
mouse, & Code is updated
battery when the system
management). BIOS is updated.
Stores memory Programmed by
module the memory
information. vendor.
Store system System BIOS
BIOS code and code is
PC configuration programmed at
data. the factory.
Code is updated
when the system
BIOS is updated.
Configuration
data and
settings are
input using the
F10 setup utility
Non-volatile memory usage 155
How is this
memory write
protected?
This memory is
not write-
protected. HP
recommends
password
protecting the
F10 Setup
utility.
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.
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.
Data cannot be
written to this
memory when
the module is
installed in a PC.
The specific
write protection
method varies
by memory
vendor.
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.