IOPort port1 = cpu.getIOUnit(IOPort.class, "P1");
port1.addPortListener(this);
ds2411.setDataPort(port1, DS2411_DATA_PIN);
IOPort port2 = cpu.getIOUnit(IOPort.class, "P2");
port2.addPortListener(this);
cpu.getIOUnit(IOPort.class, "P3").addPortListener(this);
cpu.getIOUnit(IOPort.class, "P4").addPortListener(this);
cpu.getIOUnit(IOPort.class, "P5").addPortListener(this);
cpu.getIOUnit(IOPort.class, "P8").addPortListener(this);