Audio/modem riser
Computer expansion slot for analog functionality
title: "Audio/modem riser" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["motherboard-expansion-slot", "sound-cards"] description: "Computer expansion slot for analog functionality" topic_path: "general/motherboard-expansion-slot" source: "https://en.wikipedia.org/wiki/Audio/modem_riser" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Computer expansion slot for analog functionality ::
::figure[src="https://upload.wikimedia.org/wikipedia/commons/4/40/AMR_and_PCI_slots.gk.jpg" caption="AMR (brown, at left), with PCI slot (white, at right) for comparison"] ::
::figure[src="https://upload.wikimedia.org/wikipedia/commons/3/33/AMR_Modem_1.jpg" caption="A modem with AMR interface"] ::
The audio/modem riser (AMR) is a riser expansion slot found on the motherboards of some Pentium III, Pentium 4, Duron, and Athlon personal computers. It was designed by Intel to interface with chipsets and provide analog functionality, such as sound cards and modems, on an expansion card.
Technology
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).
Technologically, it has been superseded by the Advanced Communications Riser (ACR) and Intel's own communications and networking riser (CNR). However, riser technologies in general never really took off. Modems generally remained as PCI cards while audio and network interfaces were integrated on to motherboards.
References
References
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::