Hi all, We are using the C51 with OPTIMIZE (9, SIZE) and we have a problem the code space. The question is : if we change to CX51 and use OPTIMIZE (11, SIZE) , do you think we can save some code bytes? We are using a w925EC625 from WINBOND, 80c51 based standard. Do you have another idea to reduce the code size ?. Best Regard and thanks for your help.