mirror of
https://github.com/0ldsk00l/nestopia.git
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525 lines
12 KiB
C++
525 lines
12 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////
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//
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// Nestopia - NES/Famicom emulator written in C++
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//
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// Copyright (C) 2003-2008 Martin Freij
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//
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// This file is part of Nestopia.
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//
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// Nestopia is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Nestopia is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Nestopia; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////////////
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#include <cstring>
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#include "NstBoard.hpp"
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#include "../NstTimer.hpp"
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#include "../NstFile.hpp"
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#include "NstBoardNamcot163.hpp"
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namespace Nes
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{
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namespace Core
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{
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namespace Boards
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{
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namespace Namcot
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{
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("s", on)
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#endif
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N163::N163(const Context& c)
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:
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Board (c),
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irq (*c.cpu),
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sound (*c.apu)
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{
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}
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N163::Sound::Sound(Apu& a,bool connect)
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: Channel(a)
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{
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Reset();
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bool audible = UpdateSettings();
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if (connect)
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Connect( audible );
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}
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void N163::SubReset(const bool hard)
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{
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irq.Reset( hard, hard || irq.Connected() );
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Map( 0x4800U, 0x4FFFU, &N163::Peek_4800, &N163::Poke_4800 );
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Map( 0x5000U, 0x57FFU, &N163::Peek_5000, &N163::Poke_5000 );
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Map( 0x5800U, 0x5FFFU, &N163::Peek_5800, &N163::Poke_5800 );
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Map( 0x8000U, 0x87FFU, CHR_SWAP_1K_0 );
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Map( 0x8800U, 0x8FFFU, CHR_SWAP_1K_1 );
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Map( 0x9000U, 0x97FFU, CHR_SWAP_1K_2 );
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Map( 0x9800U, 0x9FFFU, CHR_SWAP_1K_3 );
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Map( 0xA000U, 0xA7FFU, CHR_SWAP_1K_4 );
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Map( 0xA800U, 0xAFFFU, CHR_SWAP_1K_5 );
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Map( 0xB000U, 0xB7FFU, CHR_SWAP_1K_6 );
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Map( 0xB800U, 0xBFFFU, CHR_SWAP_1K_7 );
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Map( 0xC000U, 0xC7FFU, &N163::Poke_C000 );
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Map( 0xC800U, 0xCFFFU, &N163::Poke_C800 );
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Map( 0xD000U, 0xD7FFU, &N163::Poke_D000 );
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Map( 0xD800U, 0xDFFFU, &N163::Poke_D800 );
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Map( 0xE000U, 0xE7FFU, PRG_SWAP_8K_0 );
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Map( 0xE800U, 0xEFFFU, PRG_SWAP_8K_1 );
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Map( 0xF000U, 0xF7FFU, PRG_SWAP_8K_2 );
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Map( 0xF800U, 0xFFFFU, &N163::Poke_F800 );
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}
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void N163::Irq::Reset(const bool hard)
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{
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if (hard)
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count = 0;
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}
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void N163::Sound::Reset()
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{
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exAddress = 0x00;
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exIncrease = 0x01;
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startChannel = NUM_CHANNELS;
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frequency = 0;
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std::memset( wave, 0, sizeof(wave) );
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std::memset( exRam, 0, sizeof(exRam) );
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for (uint i=0; i < NUM_CHANNELS; ++i)
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channels[i].Reset();
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dcBlocker.Reset();
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}
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void N163::Sound::BaseChannel::Reset()
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{
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enabled = false;
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active = false;
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timer = 0;
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frequency = 0;
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phase = 0;
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waveLength = 0;
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waveOffset = 0;
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volume = 0;
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}
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void N163::Load(File& file)
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{
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if (board.HasBattery() && (board == Type::NAMCOT_163_S_0 || board == Type::NAMCOT_163_S_1))
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{
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const File::LoadBlock block[] =
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{
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{ wrk.Source().Mem(), board.GetWram() },
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{ sound.GetExRam(), Sound::EXRAM_SIZE }
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};
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file.Load( File::BATTERY, block );
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}
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else
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{
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Board::Load( file );
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}
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}
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void N163::Save(File& file) const
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{
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if (board.HasBattery() && (board == Type::NAMCOT_163_S_0 || board == Type::NAMCOT_163_S_1))
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{
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const File::SaveBlock block[] =
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{
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{ wrk.Source().Mem(), board.GetWram() },
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{ sound.GetExRam(), Sound::EXRAM_SIZE }
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};
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file.Save( File::BATTERY, block );
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}
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else
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{
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Board::Save( file );
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}
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}
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byte* N163::Sound::GetExRam()
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{
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return exRam;
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}
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const byte* N163::Sound::GetExRam() const
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{
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return exRam;
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}
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void N163::Sound::SaveState(State::Saver& state,const dword baseChunk) const
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{
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state.Begin( baseChunk );
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state.Begin( AsciiId<'R','E','G'>::V ).Write8( exAddress | (exIncrease << 7) ).End();
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state.Begin( AsciiId<'R','A','M'>::V ).Compress( exRam ).End();
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state.End();
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}
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void N163::Sound::LoadState(State::Loader& state)
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{
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while (const dword chunk = state.Begin())
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{
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switch (chunk)
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{
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case AsciiId<'R','E','G'>::V:
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{
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const uint data = state.Read8();
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exAddress = data & 0x7F;
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exIncrease = data >> 7;
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break;
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}
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case AsciiId<'R','A','M'>::V:
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state.Uncompress( exRam );
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for (uint i=0; i < sizeof(exRam); ++i)
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{
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wave[i*2+0] = (exRam[i] & 0xFU) << 2;
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wave[i*2+1] = (exRam[i] >> 4) << 2;
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}
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for (uint i=64; i < sizeof(exRam); i += 8)
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{
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BaseChannel& channel = channels[(i - 64) >> 3];
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channel.Reset();
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channel.SetFrequency ( FetchFrequency(i) );
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channel.SetWaveLength ( exRam[i+4] );
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channel.SetWaveOffset ( exRam[i+6] );
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channel.SetVolume ( exRam[i+7] );
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channel.Validate();
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}
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SetChannelState( exRam[0x7F] );
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break;
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}
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state.End();
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}
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}
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void N163::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'N','6','3'>::V) );
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if (baseChunk == AsciiId<'N','6','3'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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switch (chunk)
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{
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case AsciiId<'I','R','Q'>::V:
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{
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State::Loader::Data<3> data( state );
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irq.unit.count = data[1] | (data[2] << 8 & 0x7F00) | (data[0] << 15 & 0x8000);
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break;
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}
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case AsciiId<'S','N','D'>::V:
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sound.LoadState( state );
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break;
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}
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state.End();
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}
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}
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}
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void N163::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'N','6','3'>::V );
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const byte data[3] =
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{
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irq.unit.count >> 15,
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irq.unit.count >> 0 & 0xFF,
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irq.unit.count >> 8 & 0x7F
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};
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state.Begin( AsciiId<'I','R','Q'>::V ).Write( data ).End();
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sound.SaveState( state, AsciiId<'S','N','D'>::V );
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state.End();
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}
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("", on)
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#endif
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bool N163::Irq::Clock()
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{
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return (count - 0x8000 < 0x7FFF) && (++count == 0xFFFF);
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}
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inline bool N163::Sound::BaseChannel::CanOutput() const
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{
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return volume && frequency && enabled;
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}
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inline void N163::Sound::BaseChannel::Validate()
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{
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active = CanOutput();
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}
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inline void N163::Sound::BaseChannel::SetFrequency(const uint f)
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{
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frequency = f;
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}
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inline void N163::Sound::BaseChannel::SetWaveLength(const uint data)
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{
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//const dword length = (0x20UL - (data & REG_WAVELENGTH)) << PHASE_SHIFT;
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const dword length = (0x100UL - (data & REG_WAVELENGTH)) << PHASE_SHIFT;
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if (waveLength != length)
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{
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waveLength = length;
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phase = 0;
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}
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enabled = data >> REG_ENABLE_SHIFT;
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}
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inline void N163::Sound::BaseChannel::SetWaveOffset(const uint data)
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{
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waveOffset = data;
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}
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inline void N163::Sound::BaseChannel::SetVolume(const uint data)
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{
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volume = (data & REG_VOLUME) * VOLUME;
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}
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inline dword N163::Sound::BaseChannel::GetSample
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(
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const Cycle rate,
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const Cycle factor,
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const byte (&wave)[0x100]
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)
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{
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NST_VERIFY( bool(active) == CanOutput() );
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if (active)
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{
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phase = (phase + (timer + rate) / factor * frequency) % waveLength;
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timer = (timer + rate) % factor;
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return wave[(waveOffset + (phase >> PHASE_SHIFT)) & 0xFF] * dword(volume);
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}
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return 0;
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}
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N163::Sound::Sample N163::Sound::GetSample()
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{
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if (output)
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{
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dword sample = 0;
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for (BaseChannel* channel = channels+startChannel; channel != channels+NUM_CHANNELS; ++channel)
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sample += channel->GetSample( rate, frequency, wave );
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return dcBlocker.Apply( sample * output / DEFAULT_VOLUME );
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}
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else
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{
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return 0;
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}
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}
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bool N163::Sound::UpdateSettings()
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{
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uint volume = GetVolume(EXT_N163) * 68U / DEFAULT_VOLUME;
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output = IsMuted() ? 0 : volume;
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rate = GetCpuClockBase() * qaword(1UL << SPEED_SHIFT) / (GetSampleRate() * 45UL * GetCpuClockDivider());
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dcBlocker.Reset();
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return volume;
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}
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inline void N163::Sound::SetChannelState(uint data)
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{
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data = (data >> 4 & 0x7) + 1;
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frequency = dword(data) << SPEED_SHIFT;
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startChannel = NUM_CHANNELS - data;
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}
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inline dword N163::Sound::FetchFrequency(uint address) const
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{
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address &= 0x78;
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return
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(
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(dword(exRam[address+0x0] ) << 0) |
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(dword(exRam[address+0x2] ) << 8) |
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(dword(exRam[address+0x4] & 0x3U) << 16)
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);
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}
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inline void N163::Sound::WriteWave(const uint data)
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{
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const uint index = exAddress << 1;
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wave[index+0] = (data & 0xF) << 2;
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wave[index+1] = (data >> 4) << 2;
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}
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uint N163::Sound::ReadData()
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{
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const uint data = exRam[exAddress];
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exAddress = (exAddress + exIncrease) & 0x7F;
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return data;
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}
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NES_PEEK(N163,4800)
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{
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return sound.ReadData();
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}
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void N163::Sound::WriteData(const uint data)
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{
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Update();
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WriteWave( data );
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exRam[exAddress] = data;
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if (exAddress >= 0x40)
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{
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BaseChannel& channel = channels[(exAddress - 0x40) >> 3];
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switch (exAddress & 0x7)
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{
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case 0x4:
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channel.SetWaveLength( data );
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case 0x0:
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case 0x2:
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channel.SetFrequency( FetchFrequency(exAddress) );
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break;
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case 0x6:
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channel.SetWaveOffset( data );
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break;
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case 0x7:
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channel.SetVolume( data );
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if (exAddress == 0x7F)
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SetChannelState( data );
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break;
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}
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channel.Validate();
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}
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exAddress = (exAddress + exIncrease) & 0x7F;
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}
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NES_POKE_D(N163,4800)
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{
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sound.WriteData( data );
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}
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NES_PEEK(N163,5000)
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{
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irq.Update();
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return irq.unit.count & 0xFF;
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}
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NES_POKE_D(N163,5000)
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{
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irq.Update();
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irq.unit.count = (irq.unit.count & 0xFF00) | data;
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irq.ClearIRQ();
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}
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NES_PEEK(N163,5800)
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{
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irq.Update();
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return irq.unit.count >> 8;
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}
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NES_POKE_D(N163,5800)
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{
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irq.Update();
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irq.unit.count = (irq.unit.count & 0x00FF) | (data << 8);
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irq.ClearIRQ();
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}
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void N163::Sound::WriteAddress(const uint data)
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{
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NST_COMPILE_ASSERT( EXRAM_INC == 0x80 );
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exAddress = data & 0x7F;
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exIncrease = data >> 7;
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}
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void N163::SwapNmt(const uint address,const uint data) const
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{
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ppu.Update();
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nmt.Source( data < 0xE0 ).SwapBank<SIZE_1K>( address, data );
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}
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NES_POKE_D(N163,C000)
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{
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SwapNmt( 0x0000, data );
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}
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NES_POKE_D(N163,C800)
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{
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SwapNmt( 0x0400, data );
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}
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NES_POKE_D(N163,D000)
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{
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SwapNmt( 0x0800, data );
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}
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NES_POKE_D(N163,D800)
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{
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SwapNmt( 0x0C00, data );
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}
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NES_POKE_D(N163,F800)
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{
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sound.WriteAddress( data );
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}
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void N163::Sync(Event event,Input::Controllers* controllers)
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{
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if (event == EVENT_END_FRAME)
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irq.VSync();
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Board::Sync( event, controllers );
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}
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}
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}
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}
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}
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