mirror of
https://github.com/dborth/fceugx.git
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85 lines
2.0 KiB
C++
85 lines
2.0 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) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "mapinc.h"
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static uint8 prg_reg;
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static uint8 chr_reg;
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static uint8 hrd_flag;
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static SFORMAT StateRegs[] =
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{
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{ &hrd_flag, 1, "DPSW" },
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{ &prg_reg, 1, "PRG" },
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{ &chr_reg, 1, "CHR" },
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{ 0 }
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};
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static void Sync(void) {
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if (prg_reg & 0x80)
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setprg32(0x8000, prg_reg >> 6);
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else{
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setprg16(0x8000, (prg_reg >> 5) & 3);
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setprg16(0xC000, (prg_reg >> 5) & 3);
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}
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setmirror((prg_reg & 8) >> 3);
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setchr8((chr_reg & 3) | (prg_reg & 7) | ((prg_reg & 0x10) >> 1));
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}
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static DECLFR(M57Read) {
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return hrd_flag;
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}
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static DECLFW(M57Write) {
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if ((A & 0x8800) == 0x8800)
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prg_reg = V;
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else
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chr_reg = V;
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Sync();
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}
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static void M57Power(void) {
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prg_reg = 0;
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chr_reg = 0;
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hrd_flag = 0;
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M57Write);
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SetReadHandler(0x6000, 0x6000, M57Read);
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Sync();
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}
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static void M57Reset() {
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hrd_flag++;
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hrd_flag &= 3;
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FCEU_printf("Select Register = %02x\n", hrd_flag);
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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 Mapper57_Init(CartInfo *info) {
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info->Power = M57Power;
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info->Reset = M57Reset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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