Non-Volatile Memory Usage - HP Spectre x360 Maintenance And Service Manual

Non-volatile memory usage

Non Volatile
Memory Type
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
Controller (NIC)
EEPROM
Keyboard ROM
DIMM Serial
Presence Detect
(SPD)
configuration
data
System BIOS
Amount (Size) Does
this memory
store customer
data?
256 Bytes No
64 KBytes (not No
customer
accessible)
64 KBytes (not No
customer
accessible)
256 Bytes per No
memory
module, 128
Bytes
programmable
(not customer
accessible)
4 to 5 MBytes Yes
Does What
this memory is the purpose
retain data of this memory?
when power
is removed?
Yes Stores system
date and time
and limited
keyboard
controller data.
Yes Store NIC
configuration
and NIC
firmware.
Yes Stores firmware
code (keyboard,
mouse, &
battery
management).
Yes Stores memory
module
information.
Yes Store system
BIOS code
and PC
configuration
data.
How is data How
input into is this memory
this memory? write
protected?
Using the F10 This memory
Setup utility or is not write-
changing the Mic protected.
rosoft HP recommends
Windows date password
and time. protecting the
10 Setup utility.
Using a utility A utility
from the NIC is required to
vendor that can write data to
be run from DOS. this memory
and is available
from NIC vendor.
Writing data to
this ROM in an
inappropriate
manner will
render the NIC
nonfunctional.
Programmed A utility
at the factory. is required for
Code is updated writing data to
when the system this memory
BIOS is updated. and is available
on the HP websit
e. Writing data
to this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
Programmed Data cannot be
by the memory written to
vendor. this memory
when the modul
e is installed in a
PC. The specific
write protection
method varies
by memory
vendor.
System BIOS A utility
code is required for
is programmed writing data to
at the factory. this memory
Code is updated and is available
when the system on the HP websit
BIOS is updated. e. Writing data
Configuration to this ROM in an
data inappropriate
and settings are manner can
input
Non-volatile memory usage
F
83