TRD - That the new replacement for CNR/AMR/etc..
Here's the snippet (from the above linked review)
<< As for expansion slots, Iwill DVD266-R features 1 universal AGP slot, which supports AGP 2x and 4x graphics cards, 5 PCI slots and 1 ACR slot (Advanced Communication Riser), which is worth discussing in detail. This slot was first supported by the South Bridge of VIA Apollo Pro266 chipset. It is situated in the left corner of the board and resembles a standard PCI connector turned by 180 degrees. In fact, AMD introduced it as an alternative to CNR slot and provided it with a good deal of advantages. First, unlike CNR, ACR is backward compatible with AMR, i.e. it supports old AMR cards without any problems. Then, in comparison to CNR, which supports modems, HPNA, Ethernet and audio cards, ACR also enables us implement DSL and wireless network. >>