Int 62 Fn 0054 u - Fgdriver V4.02 - "fg_getxpos" - Get Graphics Cursor C [V]
AX = 0054h
Return: AX = screen space X 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=0058h,AX=007Eh,AX=007Fh