Int 62 Fn 00E4  u - Fgdriver V4.02 - "fg_yalpha" - Convert Screen Row To   [V]

   AX = 00E4h
   BX = screen space row

Return: AX = character space row containing specified coordinate

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

See Also: AX=00E1h,AX=00E5h