56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
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#pragma once
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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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// Quattro
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class Mapper232 : public Nes_Mapper {
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uint8_t regs [2];
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public:
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Mapper232()
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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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Mapper232::apply_mapping();
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}
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};
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