INT 62 u - FGDRIVER v4.02 - "FG_PCXRANGE" - GET EXTENT OF PCX IMAGE
	AX = 008Dh
	ES:BX -> variable pointer record (see #03495)
Return: indicated variables updated; if the indicated header is not valid,
	  all of the coordinate variables are set to FFFFh
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=008Ch


Format of FGDRIVER PCXRANGE variable pointer record:
Offset	Size	Description	(Table 03495)
 00h	WORD	segment of 128-byte PCX file header
 02h	WORD	offset of 128-byte PCX file header
 04h	WORD	segment of WORD buffer for X coordinate of image's left edge
 04h	WORD	offset of WORD buffer for X coordinate of image's left edge
 08h	WORD	segment of WORD buffer for X coordinate of image's right edge
 0Ah	WORD	offset of WORD buffer for X coordinate of image's right edge
 0Ch	WORD	segment of WORD buffer for Y coordinate of image's top edge
 0Eh	WORD	offset of WORD buffer for Y coordinate of image's top edge
 10h	WORD	segment of WORD buffer for X coordinate of image's bottom edge
 12h	WORD	offset of WORD buffer for X coordinate of image's bottom edge
SeeAlso: #03494