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INT 10 - VIDEO - WRITE STRING (AT,XT286,PS,EGA,VGA)
        AH = 13h
        AL = mode
            bit 1: set if string contains alternating characters and attributes
            bit 0: set in order to move cursor after write
        BL = attribute if AL bit 1 clear
        BH = display page number
        DH,DL = row,column of starting cursor position
        CX = length of string
        ES:BP -> start of string
Note:   recognizes CR, LF, BS, and bell
SeeAlso: AH=09h,0Ah