c $BBE7 Moves cursor on screen depending on direction key pressed. unknown*** is set to 2 for non-diagonal movement, and 3 for diagonal movement. In the manual, going diagonally counts as 1.5 movement points so it looks like unknown**** holds double the movement points being used
C $BBE7 preserve HL, DE
C $BBE9 set CAPS mode
C $BBEE preserve BC - cursor coords
C $BBEF jump to $CDC0 if player is computer-controlled
C $BBF6 call KEYBOARD (ROM)
C $BBF9 restore BC - cursor coords
C $BBFA store value of A (key pressed) in unknown31
C $BBFD jump to $BC09 if 'W' not pressed
C $BC01 'W' was pressed so set unknown**** to 2 and call $BC6C to decrement y-coord
C $BC09 jump to $BC15 if 'X' not pressed
C $BC0D 'X' pressed - set unknown**** to 2 and call $BC72 to increment y-coordinate
C $BC15 jump to $BC21 if 'A' not pressed
C $BC19 'A' pressed - set unknown**** to 2 and call $BC7D to decrement x-coordinate
C $BC21 jump to $BC2D if 'D' not pressed
C $BC25 'D' pressed - set unknown**** to 2 and call $BC83 to increment x-coordinate
C $BC2D jump to $BC3C if 'Q' not pressed
C $BC31 'Q' pressed - DIAGONAL MOVEMENT - set unknown**** to 3 and decrement x & y coords
C $BC3C jump to $BC4B if 'E' not pressed
C $BC40 'E' pressed - DIAGONAL MOVEMENT - set unknown**** to 3 - increment x, decrement y coords
C $BC4B jump to $BC5A if 'Z' not pressed
C $BC4F 'Z' pressed - DIAGONAL MOVEMENT - set unknown**** to 3 - increment y, decrement x coords
C $BC5A jump to $BC69 if 'C' not pressed
C $BC5E 'C' pressed - DIAGONAL MOVEMENT - set unknown**** to 3 - increment x & y coords
C $BC69 restore DE, HL
C $BC68 return