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Breakpoints can only be placed on lines containing executable code. Lines that don’t contain executable code are shown as grayed out. Double click on a line number (source window) to set a breakpoint. In the above program, two breakpoints have been set.
If nothing is displayed in the source window, you may need to set the proper assembler option flags. To do this, in DEA12 go to Tools->Assembler->Option and check the option Include Full debug information.