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A riser card inside an IBM PS/2, featuring MCA slots Motherboard of an IBM PS/ValuePoint personal computer model (c. from 1993 to 1995) with an Intel i486SX microprocessor, with an elongated connector (black, horizontally in the middle/left between upper and lower edge) for the riser card on which the ISA bus slots were located
Typically such cards are referred to as a riser card in part because they project upward from the board and allow expansion cards to be placed above and parallel to the motherboard. Expansion cards allow the capabilities and interfaces of a computer system to be extended or supplemented in a way appropriate to the tasks it will perform.
With introducing the PCI bus, the ISA connector was replaced by a riser card connector, mechanical related to the EISA connector. Typical LPX riser card, with connectors for PCI and ISA cards LPX (short for Low Profile eXtension ), originally developed by Western Digital , was a loosely defined motherboard format ( form factor ) widely used ...
The ACR specification was created by the Advanced Communications Riser Special Interest Group (ACR SIG) in 2000 with the intent to replace the AMR specification. [1] Because it was backwards compatible with AMR cards, and technically superior, it quickly replaced it. ACR is rendered obsolete by discrete components mounted on the motherboard.
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.
Communications and networking riser (CNR) is a slot found on certain personal computer motherboards and used for specialized networking, audio, or telephony equipment. A motherboard manufacturer may choose to provide such functionality in any combination on a CNR card. [ 1 ]
Based on a design by Western Digital, it allowed smaller cases than the AT standard, by putting the expansion card slots on a Riser card. Used in slimline retail PCs. LPX was never standardized and generally only used by large OEMs. Mini-LPX: Western Digital? 203–229 × 254–279 mm (8–9 × 10–11 in) Used in slimline retail PCs. PC/104
Motherboard of a model with an Intel i486SX microprocessor, with an elongated connector (black, horizontally in the middle/left between upper and lower edge) for a riser card on which the ISA bus slots were located