as desired alternatively the multimedia memory is located off chip and is coupled directly to the digital system chip 112 in one embodiment the digital system chip 112 does not include multimedia memory but rather video data and audio data are stored in the system memory 110 according to a unified memory architecture in this embodiment the digital system chip 112 preferably includes a memory buffer 234 and a direct memory access dma engine 236 for transferring data from the main memory 110 to the memory buffer 234 in the digital system chip 112 in one embodiment the video engine 202 and audio engine 204 couple through one or more i o channels to respective digital i o ports 232 including video and audio ports the digital video port is included for providing digital video data to peripheral devices such as an mpeg decoder or a digital video display the digital audio port is included for providing digital audio data to digital peripheral devices such as for external mixing as desired in an embodiment which includes a dedicated communication engine the digital system chip 112 preferably includes one or more digital communication ports 232 for coupling to an isdn line or other digital line as shown the digital system chip 112 also preferably includes a usb universal serial bus interface 222.