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INT 10 - FRIEZE v7+ - API
        AH = 4Bh
        CL = function
            00h reserved
            01h load window
                ES:BX -> ASCIZ filename from which to read
            02h save window
                ES:BX -> ASCIZ filename to which to write
            07h set window size
                ES:BX -> four-WORD structure with Xmin, Ymin, Xmax, Ymax
            09h set patterns
                ES:BX -> 16-BYTE vector of screen->printer color correspondnces
            0Ah get patterns
                ES:BX -> 16-BYTE buffer for color correspondences
            0Bh set mode
                AL = mode
            0Fh get window
                ES:BX -> four-WORD buffer for Xmin, Ymin, Xmax, Ymax
            10h set print options
                ES:BX -> printer options in same format as FRIEZE cmdline
            14h get version
                Return: AH = major version (00h if FRIEZE version before 7)
                        AL = minor version
            15h set parameters
                ES:BX -> parameter table (see below)
            16h get parameters
                ES:BX -> buffer for parameter table (see below)
            17h get printer resolution
                ES:BX -> 12-WORD table for six horizontal/vertical resol pairs
            18h reserved (v8.0 only)
Return: AX = status
            00h successful
            01h user aborted printout with ESC
            02h reserved
            03h file read error
            04h file write error
            05h file not found
            06h invalid header (not an image or wrong screen mode)
            07h file close error
            08h disk error
            09h printer error
            0Ah invalid function
            0Bh can't create file
            0Ch wrong video mode

Format of parameter table:
Offset  Size    Description
 00h    WORD    top margin (1/100 inch)
 02h    WORD    left margin (1/100 inch)
 04h    WORD    horizontal size (1/100 inch)
 06h    WORD    vertical size (1/100 inch)
 08h    WORD    quality/draft mode
                00h draft mode
                01h quality mode
                02h use horizontal/vertical resolution for output resolution
 0Ah    WORD    printer horizontal resolution (dots per inch)
 0Ch    WORD    printer vertical resolution (dots per inch)
 0Eh    WORD    reserved (FFFFh)
Note:   any field which should remain unchanged may be filled with FFFFh