Expects: AX    000eH
Returns: none
Info: This tells the mouse support to stop emulating a light pen.  You
would use this to keep the mouse movement from interfering with
the operation of an attached light pen.

When enabled via INT 33H 000dH, the mouse support apparently
intercepts INT 10H 04H.

- -

INT 33H 000eH: Disable Lightpen Emulation