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The design that I inherited incoporates two hex files. One is a bootloader that is located in the EPROM. The other is an app loaded into external Flash. The code will start in the bootloader and then jump to flash when a timer runs out. EA is not toggled so the external code relies on the interrupt vectors in the bootloader. Therefore, when I use dscope to debug the application I have to load both hex files. I could get this to work in ds51 , but dscope dumps the previous load even though it doesn't use the memory space.