Non-Volatile Memory Usage - HP 355 G2 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
140 Chapter 10 Statement of Volatility
Amount Does this
(Size) 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)
Does this What is the
memory purpose of
retain data this
when power memory?
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.
How is data How is this
input into memory
this write
memory? protected?
Using the F10 This memory is
Setup utility or not write-
changing the protected. HP
Microsoft recommends
Windows date password
and time. protecting the
F10 Setup
utility.
Using a utility A utility is
from the NIC required to
vendor that can write data to
be run from this memory
DOS. and is available
from NIC
vendor. Writing
data to this
ROM in an
inappropriate
manner will
render the NIC
nonfunctional.
Programmed at A utility is
the factory. required for
Code is writing data to
updated when this memory
the system BIOS and is available
is updated. on the HP
website.
Writing data to
this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
Programmed by Data cannot be
the memory written to this
vendor. memory when
the module is
installed in a
PC. The specific
write protection
method varies
by memory
vendor.