INT 62 u - FGDRIVER v1.10 - "FG_GETKEY" - GET NEXT KEYSTROKE
        AX = 006Eh
        ES:BX -> variable pointer record (see below)
Return: (after next keystroke if no typeahead) variables updated
SeeAlso: AX=006Fh,AX=0070h

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