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https://github.com/dborth/fceugx.git
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107 lines
2.6 KiB
C++
107 lines
2.6 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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* 63in1 ghostbusters
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*/
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#include "mapinc.h"
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static uint8 reg[2], bank;
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static uint8 banks[4] = {0, 0, 1, 2};
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static uint8 *CHRROM=NULL;
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static uint32 CHRROMSIZE;
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static SFORMAT StateRegs[]=
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{
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{reg, 2, "REGS"},
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{&bank, 1, "BANK"},
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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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if(reg[0]&0x20)
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{
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setprg16r(banks[bank],0x8000,reg[0]&0x1F);
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setprg16r(banks[bank],0xC000,reg[0]&0x1F);
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}
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else
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setprg32r(banks[bank],0x8000,(reg[0]>>1)&0x0F);
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if(reg[1]&2)
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setchr8r(0x10,0);
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else
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setchr8(0);
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setmirror((reg[0]&0x40)>>6);
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}
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static DECLFW(BMCGhostbusters63in1Write)
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{
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reg[A&1]=V;
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bank=((reg[0]&0x80)>>7)|((reg[1]&1)<<1);
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// FCEU_printf("reg[0]=%02x, reg[1]=%02x, bank=%02x\n",reg[0],reg[1],bank);
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Sync();
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}
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static DECLFR(BMCGhostbusters63in1Read)
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{
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if(bank==1)
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return X.DB;
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else
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return CartBR(A);
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}
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static void BMCGhostbusters63in1Power(void)
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{
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reg[0]=reg[1]=0;
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Sync();
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SetReadHandler(0x8000,0xFFFF,BMCGhostbusters63in1Read);
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SetWriteHandler(0x8000,0xFFFF,BMCGhostbusters63in1Write);
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}
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static void BMCGhostbusters63in1Reset(void)
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{
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reg[0]=reg[1]=0;
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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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static void BMCGhostbusters63in1Close(void)
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{
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if(CHRROM)
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FCEU_gfree(CHRROM);
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CHRROM=NULL;
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}
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void BMCGhostbusters63in1_Init(CartInfo *info)
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{
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info->Reset=BMCGhostbusters63in1Reset;
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info->Power=BMCGhostbusters63in1Power;
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info->Close=BMCGhostbusters63in1Close;
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CHRROMSIZE=8192; // dummy CHRROM, VRAM disable
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CHRROM=(uint8*)FCEU_gmalloc(CHRROMSIZE);
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SetupCartPRGMapping(0x10,CHRROM,CHRROMSIZE,0);
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AddExState(CHRROM, CHRROMSIZE, 0, "CHRROM");
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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