NervOS is a shell application for PSP’s.

Changes:

Added new icons to menu (main: Applications | sub: Calculator, Text Editor, Web Browser and USBHostFS)
Fixed 2 bugs in recovery menu.
Improved Calculator
Fixed memory issues
From now on, file browser displays ICON0.PNG when you are highlighting a PBP/CSO/ISO file
Removed NervOS Boot PBP and replaced by Main PBP.
Added Scripting System – this scripting system was made by me and it is still under creation, a lot of functions will be added on future releases and the parser will be improved.

http://forums.qj.net/f-psp-development-forum-11/t-update-nervos-205-140822.html