There were also a number of sound cards that had two or three ports because a lot of early CD-ROM drives weren’t IDE. You’d have a Sony, a Panasonic, and something else on your card in the early days. IDE on a sound card was an actual improvement.

The third common CD-ROM interface that wasn't IDE was Mitsumi.

Thank you. That’s absolutely right and I’m not sure why I blanked on it at the time of writing.

Yeah! I'm trying to get a Sound Blaster 16 with IDE + a VESA IDE controller working on a 486DX2@66