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Advanced Communications Riser
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{{Short description|PC motherboard expansion slot format}} {{One source|date=September 2023}} [[File:ACP-Bus @ ASUS A7V266.jpg|thumb|ACR expansion slot (right), on the left 2 PCI slots]] The '''Advanced Communications Riser''', or '''ACR''', is a [[Computer form factor|form factor]] and technical specification for [[PC motherboard]] [[expansion slot]]s.<ref name=":0">{{Cite web |date=2000-07-19 |title=Initiative readies advanced communications riser card standard |url=https://www.edn.com/initiative-readies-advanced-communications-riser-card-standard/ |access-date=2023-09-04 |website=edn.com}}</ref> It is meant as a supplement to [[Peripheral Component Interconnect|PCI]] slots, a replacement for the original [[Audio/modem riser]] (AMR) slots, and a competitor and alternative to Intel's [[communications and networking riser]] (CNR) slots.
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