INT E0 - DR Multiuser DOS - "A_BREAK" - SEND BREAK TO AUX DEVICE
        CL = B2h
        DX = duration of break in system ticks (0001h-FFFFh)
Return: AX = status
            0000h successful
                break signal completed
            FFFFh failed
                CX = error code
Note:   if the AUX device is currently owned by another process, this call will
          block until the device becomes available
SeeAlso: INT E0/CL=A5h,INT E0/CL=B1h