Int 62 Fn 00C7  u - Fgdriver V4.02 - "fg_testmode" - Check If Video Mode   [V]

   AX = 00C7h
   BX = desired video mode (00h-17h, also 18h-1Dh after "FG_SVGAINIT")
   CX = required number of video pages (ignore memory size if <= 0)

Return: AX = status
       0000h mode not available with requested number of pages
       0001h mode is available

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

See Also: AX=0005h,AX=00B0h