Philips CD-i

Interactive CD format co-developed by Philips and Sony (Green Book, 1986); Philips was the main hardware backer, later licensing the design to Magnavox, GoldStar/LG, Kyocera, Memorex, Grundig and others. No confirmed worldwide lifetime unit total exists (see cdi/cdi/README.md); best-documented snapshots are Philips' own October 1994 claim of a 570,000-unit installed base and a 1996 Wall Street Journal figure of 400,000 US units sold - these do not sum to a single lifetime total and are kept in notes/units_sold_note on the model record, not as a top-level figure.