The "Video Architecture Group" mentioned in the vendor ID of the output above appears to be an internal division of Apple (as noted on the last page of http://web.media.mit.edu/~vmb/papers/tuna94.pdf).
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The "Video Architecture Group" mentioned in the vendor ID of the output above appears to be an internal division of Apple (as noted on the last page of http://web.media.mit.edu/~vmb/papers/tuna94.pdf). Also seeing "Xilinx" in the output potentially indicates the video output is controlled by that chip as mentioned in the component list below.