Non-Volatile Memory Usage - HP 7 G2 1311 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 this What is the
memory retain purpose of this
data when memory?
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 is this
input into this memory 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 and is available
BIOS is on the HP
updated. website.
Writing data to
this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
Programmed Data cannot be
by the memory written to this
vendor. memory when
the module is
installed in a
PC. The
specific write
protection
method varies
by memory
vendor.
System BIOS A utility is
code is required for
programmed at writing data to
the factory. this memory
Code is and is available
updated when on the HP
the system website.
Non-volatile memory usage 25