Non-volatile memory usage
Non Volatile | Amount (Size) | Does this | Does this | What is the | How is data | How is this |
Memory Type |
| memory store | memory retain | purpose of this | input into this | memory write |
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| customer data? | data when | memory? | memory? | protected? |
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| power is |
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| removed? |
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Real Time | 256 Bytes | No | Yes | Stores system | Using the F10 | This memory is |
Clock (RTC) |
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| date and time | Setup utility or | not write- |
battery backed- |
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| and limited | changing the | protected. HP |
up CMOS |
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| keyboard | Microsoft | recommends |
configuration |
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| controller data. | Windows date | password |
memory |
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| and time. | protecting the |
(CMOS) |
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| F10 Setup |
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| utility. |
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Controller (NIC) | 64 KBytes (not | No | Yes | Store NIC | Using a utility | A utility is |
EEPROM | customer |
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| configuration | from the NIC | required to |
| accessible) |
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| and NIC | vendor that can | write data to |
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| firmware. | be run from | this memory |
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| DOS. | and is available |
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| from NIC |
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| vendor. Writing |
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| data to this |
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| ROM in an |
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| inappropriate |
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| manner will |
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| render the NIC |
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| nonfunctional. |
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Keyboard ROM | 64 KBytes (not | No | Yes | Stores firmware | Programmed at | A utility is |
| customer |
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| code | the factory. | required for |
| accessible) |
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| (keyboard, | Code is | writing data to |
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| mouse, & | updated when | this memory |
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| battery | the system | and is available |
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| management). | BIOS is | on the HP |
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| updated. | website. |
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| Writing data to |
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| this ROM in an |
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| inappropriate |
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| manner can |
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| render the PC |
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| nonfunctional. |
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DIMM Serial | 256 Bytes per | No | Yes | Stores memory | Programmed | Data cannot be |
Presence | memory |
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| module | by the memory | written to this |
Detect (SPD) | module, 128 |
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| information. | vendor. | memory when |
configuration | Bytes |
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| the module is |
data | programmable |
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| installed in a |
| (not customer |
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| PC. The |
| accessible) |
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| specific write |
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| protection |
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| method varies |
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| by memory |
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| vendor. |
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System BIOS | 4 to 5 MBytes | Yes | Yes | Store system | System BIOS | A utility is |
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| BIOS code and | code is | required for |
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| PC | programmed at | writing data to |
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| configuration | the factory. | this memory |
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| data. | Code is | and is available |
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| updated when | on the HP |
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| the system | website. |