INT 62 u - FGDRIVER v4.02 - "FG_GETKEY" - GET NEXT KEYSTROKE
	AX = 0046h
	ES:BX -> variable pointer record (see #03485)
Return: (after next keystroke if no typeahead) variables updated
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=000Ah,AX=0063h,AX=0069h,AX=00DEh,INT 16/AH=00h


Format of FGDRIVER GETKEY variable pointer record:
Offset	Size	Description	(Table 03485)
 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