heh you are making the same mistake as I did... sound input/output is from the midi/joystick port, not the middle circular one...! After searching and finding nothing I started testing all pins and got output from the joystick port. The missing breakout cable actually goes there 🤣
Unfortunately I can no longer remember what pin is what after all these years

I remember that that was the mouse port, the one the sound comes from isn't any connector I've seen.
I'm not even sure how you'd figure the rest of the pins out aside from audio l/r.

I emailed AMD asking if there were any technical docs that might have the pinout.
It's one hell of a long shot though.

[Edit]
AMD Says that specs and pinout are proprietary and not available to end users.

However, they're going to see what they can dig up so maybe there might be something useful still.

Audio would be easy to figure out, the other pins... not so much.

AMD Doesn't even have it in their database anymore. 🙁
We're DOOOMED!

Since I sold my card to someone, I re-found the pins for the audio-out... here they are for future reference...

edit:
also the drivers of the card are uploaded here: http://www.multiupload.com/OFN9Y3D0VC

.

TheLazy1 wrote:

I emailed AMD asking if there were any technical docs that might have the pinout. It's one hell of a long shot though. […]
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I emailed AMD asking if there were any technical docs that might have the pinout.
It's one hell of a long shot though.

[Edit]
AMD Says that specs and pinout are proprietary and not available to end users.

However, they're going to see what they can dig up so maybe there might be something useful still.

Audio would be easy to figure out, the other pins... not so much.

Are you serious? They really still care about protecting their proprietary secrets on something that old? Unbelievable. It's probably not even under patent protection anymore.

I wasn't surprised, but I've long since sold my VGA Stereo F/X.

I did this to the card I sold, woks perfect:

Nice hack, it's a shame that you can't use the game port though.
I can't imagine how you'd figure out which pins were for that.

you need both the knowledge and the tools to figure out the gameport pins... I lack both to that extend 🤣

Whoever makes the decision for proprietary connectors is a huge dick, also, try and think of that literally for a funny mental image.
😀