INT 62 u - FGDRIVER v3.03 - "FG_MOUSEPOS" - GET CURRENT MOUSE POSITION
        AX = 0064h
        ES:BX -> variable pointer record (see below)
Notes:  For FGDRIVER v1.10, this function was "FG_FADEIN" (see AX=0027h);
          "FG_MOUSEPOS" was AX=007Dh
SeeAlso: AX=0063h

Format of variable pointer record:
Offset  Size    Description
 00h    WORD    segment of WORD buffer for mouse column
 02h    WORD    offset of WORD buffer for mouse column
 04h    WORD    segment of WORD buffer for mouse row
 06h    WORD    offset of WORD buffer for mouse row
 08h    WORD    segment of WORD buffer for button status
 0Ah    WORD    offset of WORD buffer for button status
Note:   button status: bit 0 = left button, bit 1 = right, bit 2 = middle

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