70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
/* Copyright notice for this file:
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* Copyright (C) 2018
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*
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* This program 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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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* This mapper was added by retrowertz for Libretro port of QuickNES.
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*
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* Mapper 244 - Decathlon
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*
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*/
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#pragma once
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#include "Nes_Mapper.h"
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// https://www.nesdev.org/wiki/INES_Mapper244
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struct mapper244_state_t
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{
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uint8_t preg;
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uint8_t creg;
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};
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BOOST_STATIC_ASSERT( sizeof (mapper244_state_t) == 2 );
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class Mapper244 : public Nes_Mapper, mapper244_state_t {
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public:
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Mapper244()
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{
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mapper244_state_t *state = this;
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register_state( state, sizeof *state );
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}
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virtual void reset_state()
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{ }
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virtual void apply_mapping()
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{
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set_prg_bank( 0x8000, bank_32k, preg );
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set_chr_bank( 0x0000, bank_8k, creg );
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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 >= 0x8065 && addr <= 0x80A4 )
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{
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preg = ( addr - 0x8065 ) & 0x03;
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set_prg_bank( 0x8000, bank_32k, preg );
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}
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if ( addr >= 0x80A5 && addr <= 0x80E4 )
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{
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creg = (addr - 0x80A5 ) & 0x07;
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set_chr_bank( 0x0000, bank_8k, creg );
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}
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}
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};
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