Up for sale is one of the very first CD-ROM drives from Sony, the CDU535-51 along with 2 caddies (only one is functional and brand new) along with its controller (not IDE interface - proprietary) and analog cable audio.
The controller also supports RCA output and has an output for an external SONY CD-ROM drive. If needed, drivers for DOS will also be provided.
It is very finicky about what CD it reads, a very nice project for retro pc enthusiasts.
Any questions please ask!