Hello, I have got a problem with this dallas chip, need help. I install the mon51 like install 7,FF,0 and download to a flash ram. When I try mon51 accept the code from keil and run it. If want to put a breakpoint it also works and single step works fine, but what I run it freely and try to stop with stop shortcut on the keil it doesn't respond, the same code works fine with AT89C52. thanks friends, Tugrul