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I am using Keil C51 V3.96 (quite old) to develop the firmware for DS87C550. I can generate the code that runs correctly. But if I try to add some new & short codes, the progrm will run incorrectly. There is anything wrong with my additional codes. I suspect it's the problem of the compiler. Anyone can help?
So, don't you think your original post should contain all relevant facts? How many more posts are you going to make with a sentence or two with "obvious" facts you have "forgotten" to mention earlier?
How do we know that there isn't anything wrong with your "additional codes"? We don't even know what problems you get into - something you kind of forgot to mention.