The simulator user interface consists of a main window with several areas devoted to different aspects of the simulation. There is also a pull-down menu, and several additional windows to view the simulation.
Note that all numeric fields are in hexadecimal, except for execution time which is decimal and code disassembly which can be displayed either as hexadecimal (showing the leading "$") or decimal. You can enter a decimal value by preceding the value with a "+" or "-" character. Numeric entry fields turn red when an invalid value is present.