Used by the routine at player_controls.

Reads whichever control method the menu chose (bits 1 and 2 of $5BA4: 0 keyboard, 1 Kempston, 2 cursor keys, 3 Interface II) into one byte of bits that means the same whichever it came from, and stores it at $5BB5. The legs' handler at upd_player_bottom calls this every frame and also uses the byte as it is returned, in C.

The bits: 0 turn left, 1 turn right, 2 walk forward, 3 jump, 4 pick up or drop, 5 any key but the number keys, Caps Shift and Space. On a joystick with the menu's directional option set (bit 3 of $5BA4), bits 0, 1, 2 and 4 are instead the four directions of the stick, and bit 5 takes over picking up and dropping -- see chk_pickup_drop and handle_left_right. The directional option has no effect with the keyboard method.

While the game is won ($5BC3) or an object is falling into the cauldron ($5BC4) the controls are ignored: the byte is 0 apart from bit 5.