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When programming for an embedded system, the requirements for memory and I/O for one project will often be different from the memory and I/O requirements used in the next project. The system specific definitions are placed in the Link Command file. This is a manual task the must be done by the programmer. The Idea IDE, however, will create a default file which the programmer can modify to match the target system. For most programs the code (.text) will be placed at 900 hexadecimal and the data (.data) at 800 hexadecimal. These two segments should be defined and the object files listed afterwards.