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+the latest mame2003_plus_libretro.so  needs a little patch(retroarch core-options) to recognize of directional keys of GameShell
+
+* update launcher to the latest 
+* use Settings->Retro cores manager to delete `mame2003_plus_libretro.so`
+* back to Retro Games->MAME, setup game enigne again, the patch will be done after downloading autoly
+
+in the folder `~/.config/retroarch` there will be a `retroarch-core-options.cfg` contains the patch for mame2003_plus
+
+
+https://forum.clockworkpi.com/t/mame2003-plus-does-not-recognize-the-directional-keys-2017-08-05/4225
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