Int 62 Fn 00DF  u - Fgdriver V4.02 - "fg_waitvr" - Enable/disable Vertica  [V]

   AX = 00DFh
   BX = new state (0000h disabled, 0001h enabled)

Note:  the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)