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 Audio/modem riser (AMR) slots, and a competitor and alternative to Communications and Networking Riser (CNR) slots.
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“A resolution to avoid an evil is seldom framed till the evil is so far advanced as to make avoidance impossible.”
—Thomas Hardy (1840–1928)