ModSlaveSim's configuration settings and registers can be saved to a disk file by selecting the File → Save Settings... menu item, or by typing Ctrl-S. This will bring up a dialog that allows you to enter or select the name of the file to which you want to save the settings. Note that when you first open this dialog it displays files in your current working directory by default, but you can change this behaviour (see Running ModSlaveSim with file options ).