I would be happy to help with this but I do not have an oscilloscope, which I think might be needed in this case to visualize the output by a fine-pitch probe.

I checked with both Digikey and Mouser. This part isn't normally stocked and has to be special ordered with an (unknown) minimum quantity. I submitted a request for a quote with Digikey but I would expect the minimum to be significant as they would have to setup and tool for it specifically.

https://www.mouser.com/ProductDetail/Hirose-C … TiBCdSCwA%3D%3D

Note that "availability" is "Non-Stocked, Call for Quote".

Oh, great! I believe all you need is a simple tester.
This set up should work just fine to find the right pins. And I believe it's non-destructive.

I've ordered parts on www.digikey.com, they are on the way.

See attached images for reference.

The HRS logo appears "up" when the connector is inserted into the pcmcia card, aligned with the sticker that shows the product name and IBM logo.

The dongle has two stereo connectors, one blue, one black. I don't recall which one is the microphone and which is for audio out so I will refer to them by their color.

The pinout is as follows, counting from the rightmost pin as pin 1 when looking at the pins of the male connector with the HRS logo facing up.

Black female 3.5mm:
Pin 3 (ring)
Pin 4 (sleeve)
Pin 5 (tip)

Blue female 3.5mm:
Pin 7 (ring)
Pin 8 (sleeve)
Pin 9 (tip)

I'm using the terms sleeve, ring, and tip to eliminate any ambiguity as to how to wire this up.

Adding this additional picture to make sure that which pin I'm referring to as "pin 1" is clear.

Tested using a cable I made. Each part of the 3.5mm male end was checked for identification and continuity.

Thanks a million!!!

Please share your experience when you get your parts from DigiKey.

I'm very curious as to what they will send you as the OEM connector I have is plastic-welded together.

Sure, I will. I expect the connectos in a couple of weeks (sent from US by an intermediary).

Finally got the parts for the cable. The connector fits the card. Will assemble the cable later on today.
Here is what it all looks like.

Oh, wow. That's a really nicely made connector for soldering. I was wondering how it would fit together, as the original IBM cable doesn't come apart.

Soldering? Aren't those insulation-displacement contacts that you simply push into your insulated wires?

And...it's working 😀
Kahenraz, thank you so much for yor help! Audio out was the first(black) jack, BTW.
Benedikt, yes, that's right, no soldeirng. Insulated wires work just fine, if they are thin enough. In my case I had to strip them.

Just put this all together for ease of use.

Thanks for showing us this information. How thick are your insulated wires? Also, what's the part near the end of the audio socket called?

amang wrote on 2020-06-27, 01:50:

Thanks for showing us this information. How thick are your insulated wires? Also, what's the part near the end of the audio socket called?

I'm glad it was useful. My wires are 0.8 mm thick. That part is a ferrite bead https://en.wikipedia.org/wiki/Ferrite_bead