There are two Mask Displays per aircraft, one for the Captain and one for the First Officer (F/O). Vision display and oxygen all in one. SAVED masks provides all the vital necessities for an emergency situation.
VAS ( Video Amplifier Splitter) provides a HUD video entry point into the SAVED system. VAS receives HUD without reducing the number of HUD video output channels and It provides redundant operation with respect to aircraft power
The VC (Video converter) provides HUD video imagery as well as power to the SAVED masks