Copyright: Jeff Stenhouse, René Richard 2014 - 2017
This program 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.
This program 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 this program. If not, see http://www.gnu.org/licenses/.
The PC Henshin VHDL firmware intercepts the region check code of Turbografx-16 / PC Engine games and modifies the conditional branch at its end to fool the region check.
You will need Quartus 13.0.1 SP1 to synthesize this VHDL.