ACR sound cards definitely existed, e.g.

https://www.amazon.com/ASUS-ACR-A6CH-CHANNEL- … D/dp/B000M19JXQ

Not quite AMR but same concept.

This is a PCI sound card, and should wor with non asus motherboards allso, as long as you have the drivers.

Take a closer look 😉

I have an AMR and a CNR modem but not an actual sound card...

I'm not sure any actual sound cards going in these slots exist, I have got the impression they're meant to be used side by side with the onboard sound.

isnt a AMR Modem Card using onboard Soundchip for generating Modem Signals ?

As far as i know AMR is only a Connection to AC97 Soundchip providing necessary insulation from phone line

That's what I was finding as well.. so there really was 0 point to have an AMR audio riser card since the motherboard would already have the audio jacks in the rear I/O panel... now maybe if you wanted optical in/out there may have been a purpose, but other than that it would have been pointless.

cyclone3d wrote:

That's what I was finding as well.. so there really was 0 point to have an AMR audio riser card since the motherboard would already have the audio jacks in the rear I/O panel... now maybe if you wanted optical in/out there may have been a purpose, but other than that it would have been pointless.

Well, there still were some AT boards, ie. no rear I/O panel, so an AMR card with audio connectors would make sense.
But I have never seen such a thing, I think all AT boards with onboard sound came with a bracket, connected to the board with a ribbon cable.

AMR's entire point was to get around FCC licensing requirements for phone communication devices.
An AMR card should only have some voltage regulation to help it interface with 48V phone lines, some passives, a few diodes, and maybe some simple logic chips.

99% of the grunt work is being done by the CPU and onboard audio chip generating the required tones.

I'm grateful it exists, because it means we don't have thousands of motherboards with outdated useless modem hardware and RJ11 jacks on the IO shield.

Yes, anything connected to the telephone network needs to be extensively tested. Doing this with every new revision of every motherboard would be difficult and costly. Putting a riser slot on the board gets around this, as now you only need to test the card.

Actually AMR devices were quite cool for a very short period in the day. They were less modems than generic PC -> POTS line interfaces. With the right software they could do just about anything you would want to do with a POTS line. Of course that became rather superfluous once internet connections started to go via Ethernet instead of POTS dialup PPP.

I have an Aztech MR2800 for old times' sake in my overkill P3/Win98 system. It's not hooked up to anything now, but I'm sort of looking out for a consumer grade home PBX capable of generating line voltage to allow for dial-up connections inside the home. Terrify the children with modem handshakes 😜

There's currently an auction in one of local auction sites with this item. Is that the AMR sound card?

I think AMR has a key exactly in the middle of the slot.

Apparently there was almost no point to an AMR sound card since AMR uses the motherboard / cpu processing power to drive it and most of the time there is sufficient room on the motherboards I/O backplate for standard connections. Just an alternative way to tap into the motherboards integrated sound.

That is an ACR card?