Well, I don't think that you can play a tape in your CD-drive. The device you need is called a camcorder.
- research the (software) options to convert movies from Digital 8 to, say, DVD
- rent a camcorder
- do it
You'll have your movies on DVD forever (well, as long as a burned DVD lives, say 5 years minimum).
The good alternative: have it done. A nephew of mine currently has old video-8 movies from Grandpa being converted to DVD by a specialised company.
I no longer have my camcorder to play my digital 8 tapes. Is there some sort of adaptor or device I can buy to play them?