This window is used to display the nmemonic representation of the machine code executable that is loaded into the simulator. Loading a hex file that has not corresponding assembler source listing will still provied a disassembler listing but no source listing (the disassembler does not rely on a source listing). Where breaks exist in the machine code executable (no code is loaded into one or more program locations), these breaks are indicated in the disassembler l.isting by blank lines. Selecting a line in the disassembler listing that contains a valid machine code instruction will cause a break point for that memory location to be toggled. The corressponding assembler source line will also be selected and highlighted.