[cestith]

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.

[shdon]

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

[cestith]

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