AMR is the acronym for Audio Modem Riser, which is a specification developed by Intel. AMR packages the analog I/O audio functions of modem circuitry together with a codec chip (which converts back and forth from analog to digital) on a small board that plugs directly into a computer's motherboard. The small board is called a riser because it rises above the motherboard rather than laying flatly on it. Physically, it has two rows of 23 pins, making 46 pins total. Three drawbacks of AMR are that it eliminates one PCI slot, it is not plug and play, and it does not allow for hardware accelerated cards (only software-based).
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