INT 10 - VUIMAGE DISPLAY DRIVER (v2.20 and below)
        AX = 0F56h
        BX = 4756h
        CX = 4944h
        DL = function
            01h installation check
                Return: AX = 5649h
                        BX = 4443h
                        CX = 5647h
                        DH = 01h
            02h get first video mode's parameters
                Return: AX = BIOS mode number
                        BX = width in pixels
                        CX = height in pixels
                        DX = number of colors
            03h get next video mode's parameters
                Return: as for DL=02h
            04h display line???
                ES:DI -> record (see below)
                ???
                Return: ???
Notes:  VUIMAGE is a shareware GIF/TIFF image viewer by Offe Enterprises
        the use of TSR display drivers was discontinued after v2.20

Format of record for DL=04h:
Offset  Size    Description
 00h    WORD    row number
 02h    WORD    starting column???
 04h    WORD    ending column???
        ???