6 register map and miscellaneous functions, 1 system i/o map – HP DC5850 User Manual

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Technical Reference Guide

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4-13

System Support

The RPM (speed) of all fans is the result of the temperature of the CPU as sensed by speed
control circuitry. The fans are controlled to run at the slowest (quietest) speed that will maintain
proper cooling.

Units using chassis and CPU fans must have both fans connected to their corresponding headers
to ensure proper cooling of the system.

4.6 Register Map and Miscellaneous Functions

This section contains the system I/O map and information on general-purpose functions of the
SB700 South Bridge and SIO controller.

4.6.1 System I/O Map

Table 4-8 lists the fixed addresses of the input/output (I/O) ports.