mirror of
https://github.com/dborth/fceugx.git
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120 lines
2.8 KiB
C++
120 lines
2.8 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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*
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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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static uint8 reg[16], IRQa;
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static uint32 IRQCount;
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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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{&IRQa, 1, "IRQA"},
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{&IRQCount, 4, "IRQCOUNT"},
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{reg, 16, "REGS"},
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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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setchr1(0x0000,reg[0]&0xfe);
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setchr1(0x0400,reg[1]|1);
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setchr1(0x0800,reg[2]&0xfe);
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setchr1(0x0c00,reg[3]|1);
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setchr1(0x1000,reg[4]);
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setchr1(0x1400,reg[5]);
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setchr1(0x1800,reg[6]);
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setchr1(0x1c00,reg[7]);
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setprg8r(0x10,0x6000,0);
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setprg8(0x8000,(reg[0x8]&0xf)|0x10);
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setprg8(0xA000,(reg[0x9]&0x1f));
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setprg8(0xC000,(reg[0xa]&0x1f));
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setprg8(0xE000,(reg[0xb]&0xf)|0x10);
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setmirror((reg[0xc]&1)^1);
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}
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static DECLFW(M106Write)
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{
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A&=0xF;
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switch(A)
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{
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case 0xD: IRQa=0; IRQCount=0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0xE: IRQCount=(IRQCount&0xFF00)|V; break;
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case 0xF: IRQCount=(IRQCount&0x00FF)|(V<<8); IRQa=1; break;
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default: reg[A]=V; Sync(); break;
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}
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}
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static void M106Power(void)
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{
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reg[8]=reg[9]=reg[0xa]=reg[0xb]=-1;
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Sync();
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SetReadHandler(0x6000,0x7FFF,CartBR);
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x6000,0x7FFF,CartBW);
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SetWriteHandler(0x8000,0xFFFF,M106Write);
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}
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static void M106Reset(void)
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{
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}
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static void M106Close(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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void M106CpuHook(int a)
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{
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if(IRQa)
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{
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IRQCount+=a;
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if(IRQCount>0x10000)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa=0;
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}
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}
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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 Mapper106_Init(CartInfo *info)
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{
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info->Reset=M106Reset;
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info->Power=M106Power;
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info->Close=M106Close;
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MapIRQHook=M106CpuHook;
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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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