You can perform the following tasks with the associated commands to view the contents of the onboard boot flash memory SIMM:

To determine which file system device you are accessing, use the print working directory (pwd) command.

Router# pwd
bootflash:

To list the directory contents of any boot flash memory media, use the dir [bootflash: ] command.

Router# dir            
Directory of bootflash:/       
1  -rw-     3153784               cat2948g-in-mz.old    
2  -rw-     3153932                cat2948g-in-mz     
16777216 bytes total (7315372 bytes free)  
Router#