mirror of
https://github.com/dborth/fceugx.git
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80 lines
1.8 KiB
C++
80 lines
1.8 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., 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, delay, mirr;
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static SFORMAT StateRegs[] =
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{
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{ ®, 1, "REG" },
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{ &mirr, 1, "MIRR" },
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{ 0 }
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};
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static void Sync(void) {
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setchr8(reg);
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if (!delay) {
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setprg16(0x8000, reg);
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setprg8(0xC000, reg << 1);
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}
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setprg8(0xE000, (reg << 1) + 1);
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setmirror(((mirr & 4) >> 2) ^ 1);
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}
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static DECLFW(M175Write1) {
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mirr = V;
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delay = 1;
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Sync();
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}
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static DECLFW(M175Write2) {
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reg = V & 0x0F;
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delay = 1;
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Sync();
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}
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static DECLFR(M175Read) {
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if (A == 0xFFFC) {
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delay = 0;
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Sync();
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}
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return CartBR(A);
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}
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static void M175Power(void) {
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reg = mirr = delay = 0;
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SetReadHandler(0x8000, 0xFFFF, M175Read);
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SetWriteHandler(0x8000, 0x8000, M175Write1);
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SetWriteHandler(0xA000, 0xA000, M175Write2);
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Sync();
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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 Mapper175_Init(CartInfo *info) {
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info->Power = M175Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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