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6WXM
Figure 3: OEM Pentium
III Processor
1.6 INTRODUCE AMR
The Audio Modem Riser (AMR) is a new port that supports both audio and
modem. The main purpose of the AMR port is to provide lower cost and
higher levels of integration at all levels of the PC platform.
The backbone of the AMR interface is on AC' 97 compliant AC-Link with
support for codes. Motherboard support for an AMR interface are not only
capable of achieving the lowest possible cost for basic PC audio and
modem, but have also introduced increased motherboard flexibility enabling
robust, cost effective scalability.
The AMR is done through software and controlled by the motherboard' s I/O
Controller Hub (ICH). There are two types of AMR, one defined as primary
and another defined as secondary. If the motherboard with onboard sound
YAMAHA 744, the AMR must be used primary.
1-6
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