Int 62 Fn 000D  u - Fgdriver V3.03+ - "fg_circle" - Draw Unfilled Circle   [V]

   AX = 000Dh
   BX = radius in horizontal screen space units (> 0)

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145)
   The circle is drawn in screen space, centered at the current graphics
     cursor position
   This call is ignored in text modes

See Also: AX=0006h,AX=0008h,AX=000Eh,AX=0026h,AX=0093h