mirror of
https://github.com/0ldsk00l/nestopia.git
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153 lines
3.6 KiB
C++
153 lines
3.6 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 "../NstTimer.hpp"
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#include "NstBoard.hpp"
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#include "NstBoardBtlSmb2c.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 Btl
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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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Smb2c::Smb2c(const Context& c)
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:
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Board (c),
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prgLowerOffset (prg.Source().Size() - SIZE_8K - SIZE_4K - 0x5000),
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irq (*c.cpu)
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{}
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void Smb2c::SubReset(const bool hard)
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{
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irq.Reset( hard, true );
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if (hard)
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prg.SwapBank<SIZE_32K,0x0000>(prg.Source().Size() >= SIZE_64K);
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if (prg.Source().Size() >= SIZE_64K)
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Map( 0x4022U, &Smb2c::Poke_4022 );
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Map( 0x4122U, &Smb2c::Poke_4122 );
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Map( 0x5000U, 0x7FFFU, &Smb2c::Peek_5000 );
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}
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void Smb2c::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'B','2','C'>::V) );
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if (baseChunk == AsciiId<'B','2','C'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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if (chunk == 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.enabled = data[0] & 0x1;
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irq.unit.count = data[1] | (data[2] << 8 & 0xF00);
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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 Smb2c::SubSave(State::Saver& state) const
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{
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const byte data[3] =
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{
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irq.unit.enabled != 0,
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irq.unit.count & 0xFF,
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irq.unit.count >> 8
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};
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state.Begin( AsciiId<'B','2','C'>::V ).Begin( AsciiId<'I','R','Q'>::V ).Write( data ).End().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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void Smb2c::Irq::Reset(const bool hard)
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{
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if (hard)
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{
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enabled = false;
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count = 0;
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}
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}
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bool Smb2c::Irq::Clock()
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{
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if (enabled)
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{
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count = (count + 1) & 0xFFF;
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if (!count)
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{
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enabled = false;
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return true;
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}
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}
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return false;
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}
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NES_POKE_D(Smb2c,4022)
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{
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prg.SwapBank<SIZE_32K,0x0000>( data & 0x1 );
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}
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NES_POKE_D(Smb2c,4122)
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{
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irq.Update();
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irq.ClearIRQ();
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irq.unit.enabled = data & 0x3;
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irq.unit.count = 0;
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}
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NES_PEEK_A(Smb2c,5000)
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{
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return *prg.Source().Mem( address + prgLowerOffset );
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}
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void Smb2c::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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