mirror of
https://github.com/dborth/fceugx.git
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131 lines
2.9 KiB
C++
131 lines
2.9 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) 2005 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 is_large_banks, hw_switch;
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static uint8 large_bank;
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static uint8 prg_bank;
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static uint8 chr_bank;
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static uint8 bank_mode;
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static uint8 mirroring;
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static SFORMAT StateRegs[]=
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{
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{&large_bank, 1, "LB"},
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{&hw_switch, 1, "DIPSW"},
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{&prg_bank, 1, "PRG"},
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{&chr_bank, 1, "CHR"},
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{&bank_mode, 1, "BM"},
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{&mirroring, 1, "MIRR"},
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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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switch (bank_mode)
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{
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case 0x00:
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case 0x10: setprg16(0x8000,large_bank|prg_bank);
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setprg16(0xC000,large_bank|7);
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break;
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case 0x20: setprg32(0x8000,(large_bank|prg_bank)>>1);
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break;
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case 0x30: setprg16(0x8000,large_bank|prg_bank);
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setprg16(0xC000,large_bank|prg_bank);
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break;
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}
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setmirror(mirroring);
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if(!is_large_banks)
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setchr8(chr_bank);
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}
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static DECLFR(BMC70in1Read)
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{
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if(bank_mode==0x10)
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// if(is_large_banks)
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return CartBR((A&0xFFF0)|hw_switch);
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// else
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// return CartBR((A&0xFFF0)|hw_switch);
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else
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return CartBR(A);
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}
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static DECLFW(BMC70in1Write)
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{
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if(A&0x4000)
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{
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bank_mode=A&0x30;
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prg_bank=A&7;
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}
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else
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{
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mirroring=((A&0x20)>>5)^1;
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if(is_large_banks)
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large_bank=(A&3)<<3;
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else
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chr_bank=A&7;
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}
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Sync();
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}
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static void BMC70in1Reset(void)
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{
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bank_mode=0;
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large_bank=0;
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Sync();
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hw_switch++;
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hw_switch&=0xf;
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}
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static void BMC70in1Power(void)
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{
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setchr8(0);
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bank_mode=0;
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large_bank=0;
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Sync();
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SetReadHandler(0x8000,0xFFFF,BMC70in1Read);
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SetWriteHandler(0x8000,0xffff,BMC70in1Write);
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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 BMC70in1_Init(CartInfo *info)
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{
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is_large_banks=0;
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hw_switch=0xd;
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info->Power=BMC70in1Power;
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info->Reset=BMC70in1Reset;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void BMC70in1B_Init(CartInfo *info)
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{
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is_large_banks=1;
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hw_switch=0x6;
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info->Power=BMC70in1Power;
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info->Reset=BMC70in1Reset;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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