1) CI quadrupled 2) Double CCII 3) Early 5th-century year 4) Early fifth century date 5) Roman 404 6) Twice CCII Found on https://www.crosswordclues.com/clue/cdiv
Stands for Commodore Dynamic Total Vision. It was basically an A500 with CD-ROM drive instead of a disk drive and an infrared controller. Found on http://www.amigahistory.co.uk/c.html