Int 62 Fn 0058 u - Fgdriver V4.02 - "fg_getypos" - Get Graphics Cursor R [V]
AX = 0058h
Return: AX = screen space Y coordinate of graphics cursor position
Note: the FGDRIVER functions are rearranged with each major release, but
their parameters do not change (see #3145 at AX=0000h)
See Also: AX=0054h,AX=007Eh,AX=007Fh