92 lines
2.5 KiB
C++
92 lines
2.5 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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* Taito's X1-005 ( Rev. B ) Fudou Myouou Den
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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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struct taito_x1005_state_t
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{
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uint8_t preg [ 3 ];
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uint8_t creg [ 6 ];
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uint8_t nametable [ 2 ];
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};
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BOOST_STATIC_ASSERT( sizeof (taito_x1005_state_t) == 11 );
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// TaitoX1005
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class Mapper207 : public Nes_Mapper, taito_x1005_state_t {
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public:
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Mapper207()
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{
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taito_x1005_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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int i;
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intercept_writes( 0x7EF0, 1 );
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for ( i = 0; i < 3; i++ )
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set_prg_bank( 0x8000 + ( i << 13 ), bank_8k, preg [ i ] );
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for ( i = 0; i < 2; i++ )
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set_chr_bank( 0x0000 + ( i << 11 ), bank_2k, creg [ i ] >> 1);
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for ( i = 0; i < 4; i++ )
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set_chr_bank( 0x1000 + ( i << 10 ), bank_1k, creg [ 2 + i ] );
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mirror_manual( nametable [ 0 ], nametable [ 0 ], nametable [ 1 ], nametable [ 1 ] );
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}
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virtual bool write_intercepted( nes_time_t, nes_addr_t addr, int data )
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{
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if ( addr < 0x7EF0 || addr > 0x7EFF )
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return false;
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if ( ( addr & 0x0F ) < 6 )
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{
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creg [ addr & 0x07 ] = data;
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if ( ( addr & 0x0F ) < 2 )
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{
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nametable [ addr & 0x01 ] = data >> 7;
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mirror_manual( nametable [ 0 ], nametable [ 0 ], nametable [ 1 ], nametable [ 1 ] );
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set_chr_bank( ( addr << 11 ) & 0x800, bank_2k, creg [ addr & 0x01 ] >> 1 );
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return true;
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}
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set_chr_bank( 0x1000 | ( ( addr - 0x7EF2 ) << 10 ), bank_1k, creg [ addr & 0x07 ] );
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return true;
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}
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addr = ( addr - 0x7EFA ) >> 1;
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preg [ addr ] = data;
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set_prg_bank( 0x8000 | ( addr << 13 ), bank_8k, preg [ addr ] );
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return true;
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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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