Audio/modem riser

The audio/modem riser, also known as an 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.[1]

AMR (brown, at left), with PCI slot (white, at right) for comparison
A modem with AMR interface


Technology

Physically, it has two rows of 23 pins, making 46 pins total.[2] 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).[1]

Technologically, it has been superseded by the Advanced Communications Riser (ACR) and Intel's own Communications and Networking Riser (CNR).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.

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gollark: Hmm, what if an infinite memory device with some sort of low-end-microcontroller-grade processor hooked up, connected to the infinite processing and 1KiB of memory thing, over some sort of relatively high-latency link?
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See also

References
  1. "Definition of riser card". PC Magazine. Retrieved May 2, 2016.
  2. "Audio Modem Riser (AMR)". Techopedia. Retrieved May 2, 2016.
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