3System Board (P/Ns
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1 - 4 | - | Selects system board speed settings, refer to “Bus Frequencies” on page 72. |
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5 | Open | Enables User and Administrator passwords. | Open | |
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Closed | Clears User and Administrator passwords. |
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6 | Open | CMOS memory acts as a | Open | |
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Closed | Clears the Setup configuration data in the CMOS memory. |
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7 |
| Selects system board speed settings, refer to “Bus Frequencies” on page 72. |
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| Open | Disables secure mode. | Open | |
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Closed | Sets the security mode. Sets the switch to the closed position to prevent the |
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| BIOS from being upgraded and to disable writing to disks. |
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9 | Open | Disables | Open | |
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| Closed | Enables |
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| to Closed. This setting overrides the setting in the Setup program. |
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10 |
| Not used. |
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Processor Socket
The microprocessor is packaged in a
VRM Socket
P54CS (133 150 and 200 MHz) Pentium processors require a 3.3V supply. Since the PC has a regulated 3.3 V output, a shorting block is used to connect the output directly to the processor.
The P54C 166 MHz Pentium processor requires slightly more than 3.3 V and therefore needs an active VRE voltage regulator module (VRM), in which the voltage is derived from both the 3.3 V and 5 V outlets of the power supply.
Main Memory Sockets
There are six main memory module sockets, arranged in three banks (A to C), allowing installation of up to 128 MB DRAM.
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