mirror of
https://github.com/dborth/fceugx.git
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70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2012 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 mainreg, chrreg, mirror;
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static SFORMAT StateRegs[] =
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{
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{ &mainreg, 1, "MREG" },
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{ &chrreg, 1, "CREG" },
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{ &mirror, 1, "MIRR" },
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{ 0 }
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};
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static void Sync(void) {
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setprg32(0x8000, mainreg & 7);
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setchr8(chrreg);
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setmirror(mirror);
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}
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static DECLFW(M41Write0) {
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mainreg = A & 0xFF;
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mirror = ((A >> 5) & 1) ^ 1;
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chrreg = (chrreg & 3) | ((A >> 1) & 0xC);
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Sync();
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}
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static DECLFW(M41Write1) {
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if (mainreg & 0x4) {
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chrreg = (chrreg & 0xC) | (A & 3);
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Sync();
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}
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}
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static void M41Power(void) {
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mainreg = chrreg = 0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x67FF, M41Write0);
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SetWriteHandler(0x8000, 0xFFFF, M41Write1);
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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 Mapper41_Init(CartInfo *info) {
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info->Power = M41Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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