Dolby Cat. No. 790 Digital Input/Dolby Digital Surround EX Card. The Dolby Cat. No. 790 upgrades your Dolby CP650D to a model CP650 for digital cinema and Dolby Digital Surround EX. The Cat. No. 790 card provides four single-ended AES-3 digital inputs for PCM or coded audio (professional or consumer Dolby Digital bitstreams) necessary for digital cinema, onscreen advertising, and alternative-content digital audio playback. In addition to the inputs and formats included in the CP650D, the following digital audio formats are supported when the Cat. No. 790 is installed: