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https://github.com/dborth/fceugx.git
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85 lines
2.1 KiB
C++
85 lines
2.1 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., 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 reg_prg[4];
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static uint8 reg_chr[4];
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static uint8 dip_switch;
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static SFORMAT StateRegs[] =
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{
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{ reg_prg, 4, "PREG" },
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{ reg_chr, 4, "CREG" },
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{ 0 }
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};
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static void Sync(void) {
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setprg8(0x8000, reg_prg[0]);
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setprg8(0xa000, reg_prg[1]);
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setprg8(0xc000, reg_prg[2]);
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setprg8(0xe000, reg_prg[3]);
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setchr2(0x0000, reg_chr[0]);
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setchr2(0x0800, reg_chr[1]);
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setchr2(0x1000, reg_chr[2]);
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setchr2(0x1800, reg_chr[3]);
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setmirror(MI_V);
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}
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static DECLFW(MBS5Write) {
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int bank_sel = (A & 0xC00) >> 10;
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switch (A & 0xF000) {
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case 0x8000:
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reg_chr[bank_sel] = A & 0x1F;
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break;
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case 0xA000:
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if (A & (1 << (dip_switch + 4)))
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reg_prg[bank_sel] = A & 0x0F;
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break;
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}
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Sync();
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}
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static void MBS5Reset(void) {
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dip_switch++;
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dip_switch &= 3;
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reg_prg[0] = reg_prg[1] = reg_prg[2] = reg_prg[3] = ~0;
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Sync();
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}
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static void MBS5Power(void) {
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dip_switch = 0;
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reg_prg[0] = reg_prg[1] = reg_prg[2] = reg_prg[3] = ~0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, MBS5Write);
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}
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static void StateRestore(int version) {
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Sync();
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}
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void BMCBS5_Init(CartInfo *info) {
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info->Power = MBS5Power;
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info->Reset = MBS5Reset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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