A cable used to send audio CD sound to the computer's sound card. When playing audio CDs, CD-ROM drives output analog sound to both a headphone jack and external connector just like a CD player.

But while most eBay sellers recognized the historic value of a pioneering CD-ROM drive, the accompanying PC was typically a dime-a-dozen model and was thrown out with the rare interface card still ...

but [Chris] also has another way of doing just that which is undefeatable by a TEMPEST shielded computer. He can send one bit at a time by opening and closing a CD-ROM drive, capturing these bits ...