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 _twM0A()
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     Reset Mouse driver if mouse is found. If the mouse cursor is
     currently visible, _twM0A() hides it as part of the reset process.
     However, the mouse driver will track the position of the mouse
     cursor even though it is not displayed. Several other mouse
     defaults are also set:

        The internal cursor flag is set to -1.
        Cursor position is set to center of screen.
        Graphics cursor is an arrow.
        Text cursor is a reverse video block.
        Horizontal mickey/pixel ratio is 8:8.
        Vertical mickey/pixel ratio is 16:8.
        Double speed threshold is 64 mickeys/sec.
        No confine area.
        CRT page number is 0.

       Arguments:

     None.

       Return:

     -1 if mouse is found and reset.
      0 otherwise.

       Example:

     _twM0A() resets the mouse hardware and software and hides the
     mouse cursor.