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https://github.com/dborth/fceugx.git
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103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2012 CaH4e3
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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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#include "mapinc.h"
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static uint8 regs[9], ctrl;
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static uint8 *WRAM=NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[]=
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{
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{regs, 9, "REGS"},
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{&ctrl, 1, "CTRL"},
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{0}
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};
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static void Sync(void)
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{
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uint32 swap = ((ctrl & 2) << 11);
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setchr2(0x0000^swap,regs[0]>>1);
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setchr2(0x0800^swap,regs[1]>>1);
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setchr1(0x1000^swap,regs[2]);
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setchr1(0x1400^swap,regs[3]);
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setchr1(0x1800^swap,regs[4]);
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setchr1(0x1c00^swap,regs[5]);
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setprg8r(0x10,0x6000,0);
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setprg8(0x8000,regs[6]);
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setprg8(0xA000,regs[7]);
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setprg8(0xC000,regs[8]);
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setprg8(0xE000,~0);
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setmirror(ctrl & 1);
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}
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static DECLFW(M82Write)
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{
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if(A <= 0x7ef5)
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regs[A & 7] = V;
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else
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switch(A)
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{
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case 0x7ef6: ctrl = V & 3; break;
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case 0x7efa: regs[6] = V >> 2; break;
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case 0x7efb: regs[7] = V >> 2; break;
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case 0x7efc: regs[8] = V >> 2; break;
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}
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Sync();
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}
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static void M82Power(void)
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{
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Sync();
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SetReadHandler(0x6000,0xffff,CartBR);
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SetWriteHandler(0x6000,0x7fff,CartBW);
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SetWriteHandler(0x7ef0,0x7efc,M82Write); // external WRAM might end at $73FF
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}
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static void M82Close(void)
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{
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if(WRAM)
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FCEU_gfree(WRAM);
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WRAM=NULL;
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void Mapper82_Init(CartInfo *info)
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{
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info->Power=M82Power;
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info->Power=M82Close;
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WRAMSIZE=8192;
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WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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if(info->battery)
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{
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info->SaveGame[0]=WRAM;
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info->SaveGameLen[0]=WRAMSIZE;
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}
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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