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1.10 Management Extension Hardware
The optional Management Extension hardware provides low-cost instrumentation capabilities
designed to reduce the total cost of owning a PC. The hardware implementation is a single-chip
ASIC. Features include:
An integrated temperature sensor
Fan speed sensors for up to three fans
Power supply voltage monitoring to detect levels above or below acceptable values
Registers for storing POST hardware test results and error codes
Security switch for detecting physical intrusion, such as when the chassis lid has been removed
(even when power is off). A photosensor is used as the switch.
Remote reset capabilities from a remote peer or server through LANDesk Client Manager,
Version 3.0 and service layers (when available)
Hardware compatibility with Windows NT
When suggested ratings for temperature, fan speed, or voltage are exceeded, an interrupt is
activated.
The Management Extension circuitry connects to the ISA bus as an 8-bit I/O mapped device. It
uses these I/O addresses:
Address (hex)*
Description
80
POST codes
85
Address and control functions of the ASIC
86
Register read/write operations for the ASIC
*
These addresses are accessible only when the processor is in System
Management Mode.
†
Motherboard Description
19
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