349 lines
6.9 KiB
C++
349 lines
6.9 KiB
C++
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// Optional less-common simple mappers
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// Nes_Emu 0.7.0. http://www.slack.net/~ant/
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#include "Nes_Mapper.h"
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/* Copyright (C) 2004-2006 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details. You should have received a copy of the GNU Lesser General
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Public License along with this module; 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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#include "blargg_source.h"
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// Nina-1 (Deadly Towers only)
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class Mapper_Nina1 : public Nes_Mapper {
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byte bank;
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public:
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Mapper_Nina1()
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{
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register_state( &bank, 1 );
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}
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virtual void apply_mapping()
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{
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write( 0, 0, bank );
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}
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virtual void write( nes_time_t, nes_addr_t, int data )
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{
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bank = data;
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set_prg_bank( 0x8000, bank_32k, bank );
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}
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};
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// GNROM
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class Mapper_Gnrom : public Nes_Mapper {
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byte bank;
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public:
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Mapper_Gnrom()
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{
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register_state( &bank, 1 );
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}
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virtual void apply_mapping()
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{
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int b = bank;
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bank = ~b;
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write( 0, 0, b );
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}
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virtual void write( nes_time_t, nes_addr_t, int data )
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{
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int changed = bank ^ data;
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bank = data;
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if ( changed & 0x30 )
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set_prg_bank( 0x8000, bank_32k, bank >> 4 & 3 );
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if ( changed & 0x03 )
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set_chr_bank( 0, bank_8k, bank & 3 );
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}
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};
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// Color Dreams
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class Mapper_Color_Dreams : public Nes_Mapper {
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byte bank;
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public:
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Mapper_Color_Dreams()
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{
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register_state( &bank, 1 );
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}
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virtual void apply_mapping()
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{
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int b = bank;
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bank = ~b;
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write( 0, 0, b );
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}
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virtual void write( nes_time_t, nes_addr_t, int data )
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{
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int changed = bank ^ data;
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bank = data;
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if ( changed & 0x0f )
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set_prg_bank( 0x8000, bank_32k, bank & 0x0f );
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if ( changed & 0xf0 )
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set_chr_bank( 0, bank_8k, bank >> 4 );
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}
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};
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// Jaleco/Konami
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class Mapper_87 : public Nes_Mapper {
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byte bank;
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public:
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Mapper_87()
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{
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register_state( &bank, 1 );
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}
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void apply_mapping()
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{
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intercept_writes( 0x6000, 1 );
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write( 0, 0x6000, bank );
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}
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bool write_intercepted( nes_time_t, nes_addr_t addr, int data )
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{
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if ( addr != 0x6000 )
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return false;
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bank = data;
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set_chr_bank( 0, bank_8k, data >> 1 );
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return true;
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}
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void write( nes_time_t, nes_addr_t, int ) { }
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};
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// Camerica
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class Mapper_Camerica : public Nes_Mapper {
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byte regs [3];
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public:
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Mapper_Camerica()
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{
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register_state( regs, sizeof regs );
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}
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virtual void apply_mapping()
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{
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write( 0, 0xc000, regs [0] );
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if ( regs [1] & 0x80 )
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write( 0, 0x9000, regs [1] );
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}
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virtual void write( nes_time_t, nes_addr_t addr, int data )
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{
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if ( addr >= 0xc000 )
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{
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regs [0] = data;
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set_prg_bank( 0x8000, bank_16k, data );
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}
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else if ( (addr & 0xf000) == 0x9000 )
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{
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regs [1] = 0x80 | data;
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mirror_single( (data >> 4) & 1 );
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}
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}
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};
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// Quattro
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class Mapper_Quattro : public Nes_Mapper {
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byte regs [2];
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public:
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Mapper_Quattro()
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{
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register_state( regs, sizeof regs );
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}
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virtual void reset_state()
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{
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regs [0] = 0;
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regs [1] = 3;
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}
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virtual void apply_mapping()
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{
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int bank = regs [0] >> 1 & 0x0c;
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set_prg_bank( 0x8000, bank_16k, bank + (regs [1] & 3) );
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set_prg_bank( 0xC000, bank_16k, bank + 3 );
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}
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virtual void write( nes_time_t, nes_addr_t addr, int data )
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{
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if ( addr < 0xc000 )
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regs [0] = data;
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else
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regs [1] = data;
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Mapper_Quattro::apply_mapping();
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}
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};
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class Mapper_78 : public Nes_Mapper {
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// lower 8 bits are the reg at 8000:ffff
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// next two bits are autodetecting type
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// 0 = unknown 1 = cosmo carrier 2 = holy diver
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int reg;
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void writeinternal(int data, int changed)
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{
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reg &= 0x300;
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reg |= data;
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if (changed & 0x07)
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set_prg_bank(0x8000, bank_16k, reg & 0x07);
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if (changed & 0xf0)
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set_chr_bank(0x0000, bank_8k, (reg >> 4) & 0x0f);
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if (changed & 0x08)
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{
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// set mirroring based on memorized board type
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if (reg & 0x100)
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{
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mirror_single((reg >> 3) & 1);
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}
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else if (reg & 0x200)
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{
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if (reg & 0x08)
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mirror_vert();
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else
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mirror_horiz();
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}
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else
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{
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// if you don't set something here, holy diver dumps with 4sc set will
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// savestate as 4k NTRAM. then when you later set H\V mapping, state size mismatch.
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mirror_single(1);
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}
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}
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}
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public:
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Mapper_78()
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{
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register_state(®, 4);
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}
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virtual void reset_state()
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{
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reg = 0;
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}
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virtual void apply_mapping()
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{
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writeinternal(reg, 0xff);
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}
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virtual void write( nes_time_t, nes_addr_t addr, int data)
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{
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// heuristic: if the first write ever to the register is 0,
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// we're on holy diver, otherwise, carrier. it works for these two games...
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if (!(reg & 0x300))
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{
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reg |= data ? 0x100 : 0x200;
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writeinternal(data, 0xff);
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}
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else
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{
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writeinternal(data, reg ^ data);
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}
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}
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};
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class Mapper_212 : public Nes_Mapper {
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// something about this doesn't work right?
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// TODO: fix me
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int reg;
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void writeinternal(int data, int changed)
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{
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reg = data;
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if (changed & 0x0007)
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{
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set_chr_bank(0x0000, bank_8k, reg & 0x0007);
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}
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if (changed & 0x0008)
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{
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if (reg & 0x0008)
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{
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mirror_horiz();
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}
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else
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{
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mirror_vert();
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}
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}
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if (changed & 0x4007)
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{
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if (reg & 0x4000)
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{
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set_prg_bank(0x8000, bank_32k, reg >> 1 & 0x0003);
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}
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else
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{
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set_prg_bank(0x8000, bank_16k, reg & 0x0007);
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set_prg_bank(0xc000, bank_16k, reg & 0x0007);
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}
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}
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}
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public:
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Mapper_212()
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{
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register_state(®, 4);
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}
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virtual void reset_state()
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{
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reg = 0xffff;
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}
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virtual void apply_mapping()
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{
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//intercept_reads(0xe000, 0x2000); // some sort of bus conflict or anti-piracy bs
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writeinternal(reg, 0xffff);
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}
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/*
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// as written. this will never be hit. what's going on?
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virtual int read( nes_time_t time, nes_addr_t addr )
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{
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int ret = Nes_Mapper::read(time, addr);
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if ((addr & 0xe010) == 0x6000)
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ret |= 0x80;
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return ret;
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}*/
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virtual void write( nes_time_t, nes_addr_t addr, int data)
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{
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writeinternal(addr, addr ^ reg);
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}
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};
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void register_misc_mappers();
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void register_misc_mappers()
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{
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register_mapper<Mapper_Color_Dreams>( 11 );
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register_mapper<Mapper_Nina1>( 34 );
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register_mapper<Mapper_Gnrom>( 66 );
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register_mapper<Mapper_Camerica>( 71 );
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register_mapper<Mapper_87>( 87 );
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register_mapper<Mapper_Quattro>( 232 );
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register_mapper<Mapper_78>( 78 );
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// register_mapper<Mapper_212>( 212 );
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}
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