DW      FILLED_ELLIPSE  ; Draw a filled ellipse at (CP)

  Input:
     AX         X Radius of the ellipse
     BX         Y Radius of the ellipse

  Return:
     Nothing

This vector is used to draw a filled ellipse. The center point of the
ellipse is assumed to be at the current pointer (CP). The AX Register
contains the X Radius of the ellipse, and the BX Register contains the Y
Radius of the ellipse.