An apparatus for receiving essentially uncompressed HDTV video must generate an accurate pixel-rate clock to enable the reconstruction of a video frame. Once connected to a computer, software updates for the microprocessor may be downloaded or diagnostic information stored in the microprocessor’s memory may be uploaded for diagnostic purposes. Each datum of the database is conformed to the dimensions of the database. A page table is configured to store page table entries related to the second vertex array, the page table entries including information indicating pages that have changed from the first vertex array to a second vertex array. A row of closure panels including a main closure panel is foldably connected to the main support panel along a second minor side of the main closure panel, and a pair of side closure panels is foldably connected to the main closure panel along respective opposed major sides of the main closure panel.