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Technology [Filler] Mobile Audio+Modem Daughter Card Slot

Technical Related Threads

Azuki Mirai

Do you have a moment? A JMicron controller moment?
Registered
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"Threads must be original" - nxught, 2021 (4K UHD Blu-Ray)
This thread was made for the sole purpose of testing out nxught noot naught's thread format.


What is this?

It is a mobile implementation of Intel's Audio/modem riser slot, otherwise known as the AMR slot to most people who have seen and/or used it. The AMR slot is basically an expansion slot for Intel's Audio Codec and Modem Codec 1997 (AC'97 or MC'97) 'open' standard, which was used to provide audio and/or modem capabilities to a desktop cheaply. Other than that, it had no other uses as it was greatly limited by the AC'97 and MC'97's feature set.


Why should I give a crap about this?

You may probably not benefit from the knowledge that this thread has, despite its esoteric focus on ancient, proprietary and potentially useless features. For example, your laptop may contain this particular slot and it might potentially have something that you could use for the fun of it. Heck, maybe it might support Bluetooth through this slot and you could toy around with it. What's there not to like?


The 'expansion' slot, and the 'expansion' card

connector.jpg
This is the slot itself, otherwise known as the Tyco AMP 3-179397-0. It is used on every laptop that has:
  1. an AC'97-compliant multimedia codec
  2. a MC'97-compliant soft-modem digital signal processor
In some very rare situations, the slot used for AC'97/MC'97 expansion may not be an AMP 3-179397-0, but a Hirose DF12(5.0)-40DP-0.5V(86). So far, only one vendor is known to utilize a Hirose connector on all of their AC'97/MC'97-compliant laptops.

Who exactly? IBM. Their ThinkPads used this connector for a very dumb reason, and that reason was: 'lack of pins to add additional functionality'. In other words, they violated this standard to cram a USB connection into it (unnecessary). This made every ThinkPad incompatible with the standard AC'97/MC'97 daughter cards.



card.jpg

This is the daughter card. It is approximately 4.5 centimeters or 1.77 inches by 2.7 centimeters or 1.06 inches long, and it has two screw holes for mounting purposes. It may also contain a JST-SH connector, which is generally used on soft-modem cards.

In most implementations, the daughter card is simply used as an additional board that provides soft-modem capabilities to a laptop. Although there are more specified uses (mentioned in the standard's specification) for the card than just a soft-modem, such as an audio card, or a combination of both. Unfortunately, the slot never took off as Intel did not spend any time or effort to market it as an actual expendable slot. Instead, they left it to the manufacturer's mercy to decide if it was worth the research and development budget to focus on it. Most didn't care, as a result. Some did, but more than often those were a strange mix of proprietary and non-proprietary technologies that resulted in incompatibility with other laptops that complied to the standard.

For example, the IBM ThinkPad T23 had an odd implementation of this card that contained an Intel 82562ET Fast Ethernet controller. It also had a different connector to allow the Ethernet controller to function properly, which pretty much caused confusion among some people who tried to swap the card with an actual AC'97/MC'97 compliant card.

This was further muddied with the Acer TravelMate C110's Bluetooth + soft-modem combination card, which contained a CSR BlueCore01 USB Bluetooth 1.1 controller that was also not specified in the standard. Luckily, it used the standard's specified connector, but it unfortunately couldn't be used on any other laptop as they do not have a USB connection routed to the slot. This was never part of the standard, so this was to be expected.


The Conclusion and the Bruh Moment

Yeah, I lied. For Bluetooth, you're going to need a laptop which supports a non-standard combination. Speaking of which, there's basically next to zero laptops that support Bluetooth through the MAMDC slot.

Ethernet? Nope, only in IBM's laptops will you ever get to use such a card. Even with a custom-built adapter, making it work would be impossible as the non-standard Ethernet card has a 14-pin JST SH connector that was specifically designed to interface with IBM's motherboards. On most laptops that comply with the standard, they do not have such a socket which accepts the 14-pin connector.


Why did they use non-standard implementations of the standard?

I presume it was done for flexibility and cost reasons, and considering the standards for most laptops were non-existent back then, they could mess it up as much as they wanted without fearing backlash. Intel's standard was arguably stupid too, because the audio codec was already dealt with as most manufacturers integrated the audio codec onto the motherboard. What's the point of using another codec on a daughter card, when you already had one on-board?

So, a few decided that it was a better choice to integrate additional components onto the daughter card. This was feasible as the removal of the audio functionality freed up a lot of pin assignments, which could be better put to use with an Ethernet controller or a Bluetooth + soft-modem combination. In IBM's situation, moving the Ethernet controller onto the daughter card was a good idea as they could charge and profit more off the card than to integrate the Ethernet controller onto the motherboard (which is far more expensive than a single, small card). If they chose to integrate the Ethernet controller onto the motherboard instead, they would have to deal with the additional quality checks and costs as a result of adding more traces/connections/layers to the board.

Acer's situation was identical to IBM's as well, because they could charge more for the Bluetooth + soft-modem card as opposed to integrating the Bluetooth chip onto the motherboard. It also gave them flexibility as they could easily downgrade a model with Bluetooth, to a model without Bluetooth by simply swapping the daughter card.


TL;DR

Intel creates a standard with a retarded expansion slot; most took the cost-effective way by using it as a soft-modem card, others used it for more fancy purposes to suit their design applications. As a consequence of adding more fancy crap, some of these cards don't fit or function because they have a different connector or they need a connection that isn't specified in the standard.


My Questionable Sources

https://en.wikipedia.org/wiki/Mobile_daughter_card
http://www.thinkwiki.org/wiki/CDC_slot
https://web.archive.org/web/20110605121149/http://www.intel.com/design/mobile/archives/pdf/mdc.pdf
https://www.infobytes.de/pages/amr.pdf
https://elektrotanya.com/acer_travelmate_c110_wistron_a1_plus_rev_-1_sch.pdf/download.html
 

Chairman Miaozer

THE SANCTITY OF THIS PLACE HAS BEEN FOULED
Baby Onion
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⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠐⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠂⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
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⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣠⣶⣿⣿⣿⣿⣿⣿⣤⣔⣠⣴⣠⣄⣤⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⡤⡄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⢠⣴⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡀⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
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⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠙⠑⠉⠉⠉⣉⠁⡉⠁⠁⠐⠉⠙⠛⣿⣿⣿⣿⣿⣟⠋⠄⡔⠠⡄⠄⡀⠄⠄⠂⠄⠄⠄⠄⠄⠄⢐⣶⣶⣷⣿⣶⣶⣄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠈⠉⠄⠄⠠⠄⠄⠄⠄⢀⣿⣿⣿⣿⣿⣟⡀⠄⠄⠠⡀⠄⠄⠄⣀⣒⡾⠖⠋⣩⣴⣿⣿⣿⣿⣿⣿⣿⣿⣯⢦⠄⣀⣤⣤⣤⣦⣦⣦⣤⣤⣤⣤⣄⣀
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⢠⡄⣶⣤⢀⢴⠴⠄⢀⣾⣿⣿⣿⣿⣿⣿⣿⣶⣴⣀⣁⣀⣀⡁⣈⣤⣤⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⢿⣫⣴⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠠⢷⣷⣿⣿⣷⣶⣦⣦⣄⣩⣉⣀⣀⣁⣀⣀⣾⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⢣⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣀⣀⠄⠄⠄⠄⠄⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡟⣫⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⠄⠄⢀⣠⣴⣶⣾⣿⣿⣿⣿⣿⣿⣿⣶⣄⠄⠘⢿⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⢟⣭⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣠⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣤⣄⡀⠛⢿⣿⣿⣿⣿⣿⣿⣿⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⢃⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⡍⠛⢿⣿⣿⣿⣿⣿⢿⣿⣿⣿⣿⣿⣿⣿⣿⣯⣿⣷⣿⣟⢯⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠁⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣧⡌⢿⣿⣿⣿⣿⣿⣷⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣋⢸⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠈⠻⣿⣿⣿⣿⡯⣿⣿⣿⣿⡿⢿⠿⠿⠿⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⡿⠟⠛⠄⢾⡏⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡇⠐⠯⣿⣿⣷⣿⣿⣿⣿⣿⣿⣶⣶⣾⣿⣿⣿⣿⣿⠿⠋⠉⠁⠹⠉⠁⠄⠁⠄⠄⢈⠅⠹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⢽⡆⠄⠈⠄⠙⠉⠉⣙⢻⣿⣯⣿⣻⣿⣿⣿⣿⣿⣿⣿⣮⣿⣿⠃⠄⠄⠄⠄⢠⡄⠄⠄⣊⠄⢻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠧⣿⡁⡀⠄⠄⠄⠄⠄⠈⠙⠿⠿⣿⣿⣿⢿⢿⣿⠿⠻⠟⣋⣉⣵⢂⡄⠄⢀⠴⢟⠆⠄⠄⢈⠦⡀⢻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡏⢸⡿⠄⠄⡀⠄⠄⠄⠐⢰⣿⣽⣷⣿⣶⣬⣴⣾⣶⣿⣿⣿⣿⡿⠟⠈⢀⣀⣧⡿⣠⡐⠄⠄⠄⠳⠄⠄⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣟⡋⣼⡇⠄⢺⠄⠄⠡⡖⣦⣄⠹⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡋⠉⣄⣴⣶⣿⡿⣿⡾⠿⠄⠄⠄⠄⠄⢺⡒⠄⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠏⠄⠘⠁⠠⠈⠄⠄⠄⢹⣿⣿⣿⣶⣾⣿⣿⣿⣿⣿⣿⣷⣶⣾⣿⣿⣿⣿⣿⣿⡿⣆⠔⠄⠄⠄⠄⠄⠐⠄⠄⠘⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣇⠄⠄⠄⠘⠄⠄⠄⠄⠨⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠗⠅⠠⠄⠄⠄⠄⠄⠄⠄⠄⠂⢹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡧⠄⠄⠄⠄⠄⠄⠄⠄⠄⠸⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣛⣁⠈⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠸⣻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣯⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠘⣽⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣃⠅⠄⠄⢠⡬⠳⠁⠄⠄⠄⠄⠠⣽⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡄⠄⣀⠄⠄⠄⠄⠄⠄⠄⠄⠨⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣻⣿⠊⠄⢀⢐⡶⡏⠅⠄⠄⠄⠄⠂⢰⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡆⢐⣷⡀⠄⠄⠄⠄⠄⣀⣀⠄⢿⢛⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠇⠄⣀⣾⣾⣯⡵⣷⠄⠄⠄⠄⠄⠄⣸⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⢸⣿⡇⠄⠄⠄⠄⠄⠠⣿⡷⣀⠹⣿⣿⡛⢿⣿⣿⣿⣿⣿⣿⢿⣿⣉⣴⣿⣿⣿⣷⣿⣿⡗⠄⠄⠄⠄⠠⡀⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣯⢸⣿⡎⠄⠄⠄⠄⠄⠈⠄⣿⣿⣿⣾⣭⣿⣯⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣟⣿⣿⡁⠄⠄⠄⠄⠄⢒⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿
 
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