mirror of
https://github.com/dborth/fceugx.git
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154 lines
3.0 KiB
C++
154 lines
3.0 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) 2007 CaH4e3
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* Copyright (C) 2012 FCEUX team
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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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extern uint32 ROM_size;
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static uint8 prg[4], chr, sbw, we_sram;
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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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{prg, 4, "PRG"},
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{&chr, 1, "CHR"},
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{&sbw, 1, "SBW"},
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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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setprg8r(0x10,0x6000,0);
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setprg8(0x8000,prg[0]);
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setprg8(0xA000,prg[1]);
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setprg8(0xC000,prg[2]);
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setprg8(0xE000,prg[3]);
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setchr8(chr);
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}
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static DECLFW(M176Write_5001)
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{
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if(sbw)
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{
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prg[0] = V*4;
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prg[1] = V*4+1;
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prg[2] = V*4+2;
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prg[3] = V*4+3;
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}
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Sync();
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}
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static DECLFW(M176Write_5010)
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{
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if(V == 0x24) sbw = 1;
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Sync();
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}
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static DECLFW(M176Write_5011)
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{
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V >>= 1;
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if(sbw)
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{
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prg[0] = V*4;
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prg[1] = V*4+1;
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prg[2] = V*4+2;
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prg[3] = V*4+3;
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}
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Sync();
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}
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static DECLFW(M176Write_5FF1)
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{
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V >>= 1;
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prg[0] = V*4;
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prg[1] = V*4+1;
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prg[2] = V*4+2;
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prg[3] = V*4+3;
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Sync();
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}
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static DECLFW(M176Write_5FF2)
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{
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chr = V;
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Sync();
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}
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static DECLFW(M176Write_A001)
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{
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we_sram = V & 0x03;
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}
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static DECLFW(M176Write_WriteSRAM)
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{
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// if(we_sram)
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CartBW(A,V);
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}
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static void M176Power(void)
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{
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SetReadHandler(0x6000,0x7fff,CartBR);
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SetWriteHandler(0x6000,0x7fff,M176Write_WriteSRAM);
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0xA001,0xA001,M176Write_A001);
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SetWriteHandler(0x5001,0x5001,M176Write_5001);
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SetWriteHandler(0x5010,0x5010,M176Write_5010);
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SetWriteHandler(0x5011,0x5011,M176Write_5011);
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SetWriteHandler(0x5ff1,0x5ff1,M176Write_5FF1);
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SetWriteHandler(0x5ff2,0x5ff2,M176Write_5FF2);
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we_sram = 0;
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sbw = 0;
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prg[0] = 0;
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prg[1] = 1;
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prg[2] = (ROM_size-2)&63;
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prg[3] = (ROM_size-1)&63;
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Sync();
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}
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static void M176Close(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 Mapper176_Init(CartInfo *info)
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{
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info->Power=M176Power;
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info->Close=M176Close;
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GameStateRestore=StateRestore;
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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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AddExState(&StateRegs, ~0, 0, 0);
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}
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