(Compact Disc Interactive, CD-I) The interactive multimedia platform developed by Philips, based on a Motorola 68000 processor and compact disc drive, with universal technical specifications. CD-I supports three levels of audio in stereo and mono, four graphics formats at various levels, four images planes, in/out devices including a remote control unit and keyboard, and output to ordinary TV sets, under its own dedicated operating system (CD-RTOS).