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https://github.com/dborth/fceugx.git
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95 lines
1.9 KiB
C++
95 lines
1.9 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2002 Xodnizel
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mapinc.h"
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//zero 14-apr-2012 - redid this entirely to match bizhawk
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#define rg mapbyte1
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static void DoSync(uint32 A)
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{
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int S = A & 1;
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int M_horz = (A>>1)&1;
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int p = (A >> 2) & 0x1F;
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p += (A&0x100) ? 0x20 : 0;
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bool o = (A>>7)&1;
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bool L = (A>>9)&1;
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if (o && !S )
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{
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ROM_BANK16(0x8000,p);
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ROM_BANK16(0xC000,p);
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}
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if (o && S )
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{
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ROM_BANK16(0x8000,p);
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ROM_BANK16(0xC000,p+1);
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}
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if (!o && !S && !L )
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{
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ROM_BANK16(0x8000,p);
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ROM_BANK16(0xC000,p&0x38);
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}
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if (!o && S && !L )
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{
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ROM_BANK16(0x8000,p&0x3E);
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ROM_BANK16(0xC000,p&0x38);
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}
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if (!o && !S && L)
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{
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ROM_BANK16(0x8000,p);
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ROM_BANK16(0xC000,p|7);
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}
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if (!o && S && L )
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{
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ROM_BANK16(0x8000,p&0x3E);
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ROM_BANK16(0xC000,p|7);
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}
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rg[0]=A;
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rg[1]=A>>8;
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MIRROR_SET((A>>1)&1);
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}
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static DECLFW(Mapper227_write)
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{
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DoSync(A);
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}
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static void M227Reset(void)
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{
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DoSync(0);
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}
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static void M227Restore(int version)
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{
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DoSync(rg[0]|(rg[1]<<8));
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}
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void Mapper227_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper227_write);
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MapperReset=M227Reset;
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GameStateRestore=M227Restore;
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M227Reset();
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}
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