INT 2F - Kingswood ANSI display driver - SET FLAGS
        AX = 3912h
        BL = 04h
        CL = new flags
            bit 0: do not wrap at end of line
            bit 1: wait for beeps to end before displaying next character
            bit 2: do not use graphics cursor
Return: AL = old flags
        SI,DI,DS,ES preserved
SeeAlso: AX=3900h,AX=3912h/BL=03h

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