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To Install FreeIntv on RetroPie 4.2:
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Installing FreeIntv is simple, though you'll need a basic
understanding of file system operations and be comfortable
working from the command line.

Specifically, you'll need to know how to change directories,
how to move or copy files, and how to edit text files.

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Step 1:  Create the necessary directories
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	> sudo mkdir /opt/retropie/libretrocores/lr-freeintv

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Step 2: Install the libreto core
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Copy the file:

	freeintv_libretro.so
to: 
	/opt/retropie/libretrocores/lr-freeintv

Be sure to set permissions to 755:

	> sudo chmod 755 /opt/retropie/libretrocores/lr-freeintv/*

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Step 3: Add the retroarch config file
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Add the file:

	retroarch.cfg
to:
	/opt/retropie/configs/intellivision

Be sure to set permissions to 755:

	> sudo chmod 755 /opt/retropie/configs/intellivision/*

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Step 4:  
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If you're already using an Intellivision emulator, add the line:

	lr-freeintv = "/opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-freeintv/freeintv_libretro.so --config /opt/retropie//configs/intellivision/retroarch.cfg %ROM%"

to the top of the file:

	/opt/retropie/configs/intellivision/emulators.cfg

Optionally, you can choose to set it as default, as is the case for
the included emulators.cfg file.

If not, copy the included emulators.cfg file to:

	/opt/retropie/configs/intellivision/

Be sure to set permissions to 755:

	> sudo chmod 755 /opt/retropie/configs/intellivision/*

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Step 5: Restart EmulationStation and play some Intellivision! 
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George Plimpton would approve.

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Remember that FreeIntv is free software
----------------------------------------------------------------

FreeIntv is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

FreeIntv is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with FreeIntv.  If not, see http://www.gnu.org/licenses/