I have PSP E1008 and Retroarch 1.3.3
Using Fceumm (or Nestopia) I’m notice, that Retroarch crops full screen
But stand-alone emulator (for PSP) Nestopia not crop screen
I don’t know how fix it (for Retroarch). I nothing find in Retroarch settings
Any idea?
In settings > video, make sure crop overscan is disabled. For Nestopia, it has overscan cropping settings inside the core options menu.
Oh! Thank you very much! It works!
Why I so blind? 
(When I tested setting - not noticed that Retroarch needs reload )
works , works works