I recently picked up an IBM SFF Thinkcentre (P4) that I'm enjoying restoring. From what I've seen of old writeups and YouTube videos these machines (model 8171) came from the factory with an IDE DVD drive, but SATA hard drive. So I was a little surprised there is no CD audio header on the motherboard. I guess this was already the era of digital CD audio, even over IDE? But it feels like would be cool to have the option of working CD Audio for games that use it in DOS etc (using SBEMU).

Looking closely at the motherboard, there is an unpopulated set of solder blobs at 4 pin spacing, very close to the rest of the audio circuitry. (JP14?)

I have to replace some leaking caps on this motherboard anyway, so could I just solder on some Arduino style pin headers here?

Or are there likely to be other unpopulated components that would be necessary? Looking closely the two outer pins seem to be connected via the unpopulated C71. There are a lot of other empty solder pads round here too ...

Or maybe I've got it wrong and this isn't CD audio at all?

I guess I could fit a PCI sound card in the riser, but I was planning to use the PCI slot for a GeForce FX 5500 (for better Win98 compatibility). So I'd need to find a 1x PCIe graphics card to use the 32-bit PCI for sound ...

Thoughts gratefully appreciated!