118 lines
2.6 KiB
C++
118 lines
2.6 KiB
C++
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// 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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// NROM
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class Mapper_Nrom : public Nes_Mapper {
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public:
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Mapper_Nrom() { }
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virtual void apply_mapping() { }
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virtual void write( nes_time_t, nes_addr_t, int )
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{
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// empty
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}
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};
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Nes_Mapper* Nes_Mapper::make_nrom() { return new Mapper_Nrom; }
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// UNROM
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class Mapper_Unrom : public Nes_Mapper {
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byte bank;
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public:
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Mapper_Unrom()
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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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enable_sram(); // at least one UNROM game needs sram (Bomberman 2)
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set_prg_bank( 0x8000, bank_16k, bank );
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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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bank = handle_bus_conflict( addr, data );
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set_prg_bank( 0x8000, bank_16k, bank );
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}
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};
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Nes_Mapper* Nes_Mapper::make_unrom() { return new Mapper_Unrom; }
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// AOROM
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class Mapper_Aorom : public Nes_Mapper {
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byte bank;
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public:
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Mapper_Aorom()
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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; // force update
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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 & 0x10 )
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mirror_single( bank >> 4 & 1 );
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if ( changed & 0x0f )
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set_prg_bank( 0x8000, bank_32k, bank & 7 );
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}
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};
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Nes_Mapper* Nes_Mapper::make_aorom() { return new Mapper_Aorom; }
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// CNROM
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class Mapper_Cnrom : public Nes_Mapper {
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byte bank;
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public:
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Mapper_Cnrom()
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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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set_chr_bank( 0, bank_8k, bank & 7 );
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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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bank = handle_bus_conflict( addr, data );
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set_chr_bank( 0, bank_8k, bank & 7 );
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}
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};
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Nes_Mapper* Nes_Mapper::make_cnrom() { return new Mapper_Cnrom; }
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