Used by the routine at PLAYER_LEGS.

Called by the legs (PLAYER_LEGS) every turn, with the top kept out of the collision scans. He steps forward -- 3 units the way he faces, plus any nudge a doorway has left (CALC_PLYR_DUV) -- while jumping, during the walk into a room, or when walk is held; but not on the turn a turn starts, when the legs have an in-between graphic (bit 3 set: 24-27). Then gravity: 2 off the Z step every turn, or 1 while he is still rising (or level) with jump held, so that holding jump jumps higher. The Z step is copied to PLAYER_DZ, a fall faster than 2 a turn makes a sound pitched by the height (BEEP_BY_Z), and ADJ_FOR_OUT_OF_BOUNDS cuts the move short against the floor, the walls and the other objects. HANDLE_EXIT_SCREEN takes him out of the room if the move carries him through a doorway, and does not come back; otherwise the move is made (the second half of DEC_DZ_AND_UPDATE_UVZ). A move down that was stopped (bit 2 of +$0C) is a landing, and ends the jump. The U and V steps are then cleared; the Z step carries over as his speed.

While the scene after a game runs (GAME_OVER) the Z step is set to 2 every turn, which gravity brings back to 0: the robot hangs where he is. Knight Lore does the same while something floats into its cauldron.

This is Knight Lore's routine, the falling sound and the exit check included; Pentagram keeps neither. The turning legs (TURNING_LEGS) come in at MOVE_IF_WALKING and APPLY_GRAVITY, and LOOSE_VALVE, PUSHABLE and EXTRA_LIFE end their own updates at CLEAR_DUV.