public void test1() {
System.out.println("A contorted loopback test with overlapped IO for WinAPI");
String COM = "COM5:";
HANDLE hComm = CreateFileA(COM, GENERIC_READ | GENERIC_WRITE, 0, null, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, null);
check(SetupComm(hComm, 2048, 2048), "SetupComm ");
DCB dcb = new DCB();
dcb.DCBlength = dcb.size();