In the new update pakage there is a subdirectory ..\c51\examples\farmemroy\4MB variable on clasic 8051, the project file "Far 8051" in this DIR can be compiled correct without any error,but when I use the uv2 DEBUG to test the result, the following phrases and sentences can not work properly: for (i = 0; i < sizeof (large_array0); i++) { large_array0[i] = (unsigned char) i; // just an example large_array1[i] = (unsigned char) i+0x80; // just an example } for (i = 0; i < 20; i++) { printf ("\nRead large_array1[0x%X]=%bX", i, large_array1[i]); } can not printf any infomation on the serial window, please tell me what's the matter? are this a BUG?