Initialised to 208 by the routine at 34762, and used by the routines at 35245, 35591, 36307, 36564, 36796, 37310, 38064, 38098, 38196, 38344 and 38455. Holds the LSB of the address of the entry in the screen buffer address lookup table at 33280 that corresponds to Willy's pixel y-coordinate; in practice, this LSB is twice Willy's actual pixel y-coordinate. Note that when Willy is standing on a ramp, this holds his y-coordinate rounded down to the nearest multiple of 16 (8x2).