Non-Volatile Memory Usage - HP 242 G1 Maintenance And Service Manual

Non-volatile memory usage

Non Volatile Amount
Memory Type (Size)
Real Time Clock 256 Bytes
(RTC) battery
backed-up
CMOS
configuration
memory (CMOS)
Controller (NIC) 64 Kbytes
EEPROM (not
customer
accessible)
Keyboard ROM 64 Kbytes
(not
customer
accessible)
DIMM Serial 256 Bytes
Presence Detect per memory
(SPD) module, 128
configuration Bytes
data programmabl
e (not
customer
accessible)
System BIOS 4 to 5
MBytes
Does this Does this
memory memory
store retain data
customer when
data? power is
removed?
No Yes
No Yes
No Yes
No Yes
Yes Yes
What is the How is data input into this
purpose of memory?
this memory?
Stores system Using the F10 Setup utility
date and time or changing the Microsoft®
and limited Windows® date & time.
keyboard
controller data.
Store NIC Using a utility from the NIC
configuration vendor that can be run from
and NIC DOS.
firmware.
Stores Programmed at the factory.
firmware code Code is updated when the
(keyboard, system BIOS is updated.
mouse, &
battery
management).
Stores Programmed by the
memory memory vendor.
module
information.
Store system System BIOS code is
BIOS code programmed at the factory.
and PC Code is updated when the
configuration system BIOS is updated.
data. Configuration data and
settings are input using the
F10 setup utility or a
custom utility.
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 non-
functional.
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 non-
functional.
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 non-
functional.
Non-volatile memory usage 95