CDTV's did not come stock with SCSI, but a third party adapter called SCSI-TV was made to plug into the expansion slot. Never actually seen one myself, but I recall reading that the CDTV cover would just *barely* fit back on after installation.
Just went to
the Commodore CDTV Information Center (I highly recommend this site for all things CDTV) and found this link:
http://www.cdtv.org.uk/amitrix.htmlThe site also shows a couple other SCSI adapters I hadn't been aware of.
Who knows where you'd find one these days, I haunted eBay for months without seeing one.
