First post, by dormcat
- Rank
- Oldbie
I have noticed that most motherboards of Pentium 3 / K7 (Athlon) era have an audio/modem riser (AMR) slot. Some MB have less common communications and networking riser (CNR) or even more rare advanced communications riser (ACR).
I know their existence have something to do with FCC regulations (so MB manufacturers could just send one module for FCC reviewing and use it on all their MB, rather than sending all models of MB to FCC), but I haven't seen any computer using those slots in person. Most -- if not all -- computers of the era with no sound card, modem, or NIC integrated into MB kept using PCI versions of those expansion cards, until a couple years later most MB have sound card and Ethernet integrated.
So how did those riser slots benefit a computer?