Motherboard Description
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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.
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