Used by the routine at PLAYER_LEGS.

Two ways of steering. Rotational control -- the keyboard's always, and a joystick's unless directional control is chosen -- turns a quarter at a time on the two turn controls: bit 0 of C left, bit 1 right. Directional control, a joystick with bit 3 of CONTROL set (key 5 on the menu), treats the controls as four points of the compass instead: pushing one turns the robot towards it and, once he faces it, walks him that way.

Facings, as GET_SPRITE_DIR gives them: bit 2 of the graphic and bit 6 of the flags, the mirror bit, make a number 0 to 3 (the mirror bit the high bit); a left turn goes 0, 3, 1, 2 and round, a right turn the other way. Directional control reads up (bit 2) -- which faces 2 -- unless left is also held, then right (1), down (bit 4; 3) and left (0), and goes the short way round, or two turns for an about-face.

A turn is not made at once, as in Knight Lore and Pentagram. The legs become one of four part-way graphics, 24 to 27, from TURN_RIGHT_VIEWS for a right turn or TURN_LEFT_VIEWS for a left one, by the facing; bit 0 of +$0D records which way, and bits 1-2 a count of one. Their update routine (TURNING_LEGS) holds that frame for two turns and then puts in the new facing's standing graphic (17 or 21, with its mirror bit), so a quarter turn takes three turns (measured: holding a turn key, the legs' graphic at the end of each turn went 26, 26, then 17 mirrored, and so on round). The top follows the legs' graphic, 16 higher (TOP_FOLLOWS_LEGS). No turn is started during the walk into a room, or in a jump; directional control also waits until he stands on something.