Used by the routine at UPDATE_KNIGHT.

The low three bits of his facing (+6) are a turn delay: while it is not 0 it counts down and he cannot turn. A turn sets it to 1, so a turn key held down turns him a quarter every other turn.

With the keyboard, or a stick with rotational control, left and right turn him a quarter (left subtracts $40 from the facing, right adds it) and walking is left to KNIGHT_WALKS. With a stick and directional control (CONTROL bits 1-2 not 0, bit 3 set), the stick's direction is a facing -- up +V, right +U, down -V, left -U, turned round with the town (SWAP_STICK) -- and he turns a quarter towards it, a random way if it is behind him, walking (bit 2 of E) only once he faces it. The stick is read as up (unless left is held too), then right, down and left, so a diagonal counts as one of its two directions.

Then, from offset 139 (SET_KNIGHT_LOOK, also the entry while he appears), his picture: FACING_LOOKS gives the mirror bit and whether he is seen from the front, by his facing and the view.