Int 62 Fn 0074  u - Fgdriver V3.03 - "fg_pcxmode" - Get Optimal Video Mod  [V]

   AX = 0074h
   ES:BX -> PCX header (see AX=0073h)

Return: AX = optimal video mode for PCX file
       FFFEh not a valid PCX header
       FFFFh unable to determine compatible video mode

Note:  For FGDRIVER v1.10, this function was "FG_SCRLOCK" (see AX=0088h);
      "FG_PCXMODE" did not exist yet

See Also: AX=0073h,AX=009Ah