The audio/modem riser (AMR) is a riser

expansion slot Expansion may refer to: Arts, entertainment and media * '' L'Expansion'', a French monthly business magazine * ''Expansion'' (album), by American jazz pianist Dave Burrell, released in 2004 * ''Expansions'' (McCoy Tyner album), 1970 * ''Expansi ...

found on the

motherboards A motherboard (also called mainboard, main circuit board, mb, mboard, backplane board, base board, system board, logic board (only in Apple computers) or mobo) is the main printed circuit board (PCB) in general-purpose computers and other expand ...

of some

Pentium Pentium is a brand used for a series of x86 architecture-compatible microprocessors produced by Intel. The original Pentium processor from which the brand took its name was first released on March 22, 1993. After that, the Pentium II and P ...

III, Pentium 4,

Duron Duron is a line of budget x86-compatible microprocessors manufactured by AMD. Released on June 19, 2000 as a lower-cost offering to complement AMD's then mainstream performance Athlon processor line, it also competed with rival chipmaker Inte ...

, and

Athlon Athlon is the brand name applied to a series of x86-compatible microprocessors designed and manufactured by Advanced Micro Devices (AMD). The original Athlon (now called Athlon Classic) was the first seventh-generation x86 processor and the fi ...

personal computers A personal computer (PC) is a multi-purpose microcomputer whose size, capabilities, and price make it feasible for individual use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or tec ...

. It was designed by

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 seri ...

to interface with chipsets and provide analog functionality, such as

sound card A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under the control of computer programs. The term ''sound card'' is also applied to external audio ...

s and

modem A modulator-demodulator or modem is a computer hardware device that converts data from a digital format into a format suitable for an analog transmission medium such as telephone or radio. A modem transmits data by Modulation#Digital modulati ...

s, 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 In computing, a plug and play (PnP) device or computer bus is one with a specification that facilitates the recognition of a hardware component in a system without the need for physical device configuration or user intervention in resolving resou ...

, and it does not allow for hardware accelerated cards (only software-based). Technologically, it has been superseded by the

Advanced Communications Riser {{unreferenced, date=June 2009, bot=yes The Advanced Communications Riser, or ACR, is a form factor and technical specification for PC motherboard expansion slots. It is meant as a supplement to PCI slots, a replacement for the original Audio/ ...

(ACR) and Intel's own

communications and networking riser Communications and networking riser (CNR) is a slot found on certain PC motherboards and used for specialized networking, audio, and telephony equipment. A motherboard manufacturer can choose to provide audio, networking, or modem functionality in ...

(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.

Technology

See also

References

Further reading