serial communication does not works between two AT89c512 PI24 microcontroller without max232 weather there is possibilities for communication or we must use max232?
No, I can not waste my time to be more clear. Notice the difference in length of your post and mine. You don't waste time writing much - despite this being _your_ problem. Why should I invest time writing more when this isn't my problem?
People respond to facts. You don't post facts. People then don't want to cover all bases just in case.