HP Desktop Pro A G3 MT Maintenance and Service Guide - Page 110
Nonvolatile memory usage
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Nonvolatile memory usage Nonvolatile Memory Type Amount (Size) HP Sure Start flash 8 MBytes (select models only) Does this memory store customer data? No Real Time Clock 256 Bytes No (RTC) battery backed-up CMOS configuration memory Controller (NIC) EEPROM 64 KBytes (not No customer accessible) DIMM Serial 256 Bytes per No Presence Detect memory (SPD) module, 128 configuration data Bytes programmable (not customer accessible) System BIOS 9 MBytes Yes Does this memory retain data when power is removed? What is the purpose of this How is data input into this memory? memory? How is this memory write-protected? Yes Provides Data cannot be written to this This memory is protected protected device via the host processor. by the HP Sure Start backup of The content is managed Embedded Controller. critical System solely by the HP Sure Start BIOS code, EC Embedded Controller. firmware, and critical computer configuration data for select platforms that support HP Sure Start. For more information, see Using HP Sure Start (select models only) on page 105. Yes Stores system RTC battery backed-up CMOS This memory is not write- date and time is programmed using the protected. and noncritical Computer Setup (BIOS), or data. changing the Microsoft Windows date & time. Yes Stores NIC NIC EEPROM is programmed A utility is required to configuration using a utility from the NIC write data to this memory and NIC vendor that can be run from and is available from the firmware. DOS. NIC vendor. Writing data to this ROM in an inappropriate manner will render the NIC non- functional. Yes Stores memory DIMM SPD is programmed by Data cannot be written to module the memory vendor. this memory when the information. module is installed in a computer. The specific write-protection method varies by memory vendor. Yes Stores system System BIOS code is NOTE: Writing data to BIOS code and programmed at the factory. this ROM in an computer Code is updated when the inappropriate manner can configuration system BIOS is updated. render the computer non- data. Configuration data and functional. settings are input using the Computer Setup (BIOS) or a custom utility. A utility is required for writing data to this memory and is available on the HP website; go to http://www.hp.com/ support. Select Find your 102 Chapter 13 Statement of memory volatility