The less expensive solution was the addition of a dedicated CD-ROM interface, which was typically included as an expansion option on a sound card.
PC motherboards initially did not come with support for more than simple beeps from internal speakers; thus, sound cards (such as the Sound Blaster Pro) were available for use with games, operating system and software event sounds, or to listen to audio CDs.
The term Integrated Drive Electronics refers not just to the connector and interface definition, but also to the fact that the drive controller is integrated into the drive, as opposed to a separate controller on or connected to the motherboard.
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It has largely been replaced by SATA in newer systems.
Example of a 1992 80386 PC motherboard with nothing built in other than memory, keyboard, processor, cache, realtime clock, and slots.
Such basic motherboards could have been outfitted with either the ST-506 or ATA interface, but usually not both.
A single 2-drive ATA interface and a floppy interface was added to this system via the 16-bit ISA card.
This relieved the mainboard and interface cards in the host computer of the chores of stepping the disk head arm, moving the head arm in and out, and so on, as had to be done with earlier ST-506 and ESDI hard drives.