INT 62 u - FGDRIVER v3.03 - "FG_GETKEY" - GET NEXT KEYSTROKE
        AX = 003Ah
        ES:BX -> variable pointer record (see below)
Return: (after next keystroke if no typeahead) variables updated
Note:   For FGDRIVER v1.10, this function was unused; "FG_GETKEY" was AX=006Eh
SeeAlso: AX=000Ah,AX=0051h,AX=0054h,AX=00ADh,INT 16/AH=00h

Format of variable pointer record:
Offset  Size    Description
 00h    WORD    segment of BYTE buffer for ASCII keycode
 02h    WORD    offset of BYTE buffer for ASCII keycode
 04h    WORD    segment of BYTE buffer for extended keycode
 06h    WORD    offset of BYTE buffer for extended keycode

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