HP Mobile POS G2 Solution, Mobile POS G1 Solution manual Non-volatile memory usage, Cmos

Non-volatile memory usage

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

102 Chapter 9 Statement of Volatility