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https://github.com/dborth/fceugx.git
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80 lines
1.9 KiB
C++
80 lines
1.9 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) 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 bank, preg;
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static SFORMAT StateRegs[] =
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{
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{ &bank, 1, "BANK" },
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{ &preg, 1, "PREG" },
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{ 0 }
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};
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static void Sync(void) {
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if (bank & 0x40) {
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setprg32(0x8000, (bank & 0xE) | (preg & 1));
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setchr8(((bank & 0xE) << 2) | ((preg >> 4) & 7));
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} else {
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setprg32(0x8000, bank & 0xF);
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setchr8(((bank & 0xF) << 2) | ((preg >> 4) & 3));
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}
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setmirror((bank >> 7) ^ 1);
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}
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DECLFR(M234ReadBank) {
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uint8 r = CartBR(A);
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if (!bank) {
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bank = r;
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Sync();
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}
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return r;
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}
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DECLFR(M234ReadPreg) {
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uint8 r = CartBR(A);
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preg = r;
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Sync();
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return r;
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}
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static void M234Reset(void) {
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bank = preg = 0;
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Sync();
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}
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static void M234Power(void) {
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M234Reset();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetReadHandler(0xFF80, 0xFF9F, M234ReadBank);
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SetReadHandler(0xFFE8, 0xFFF7, M234ReadPreg);
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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 Mapper234_Init(CartInfo *info) {
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info->Power = M234Power;
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info->Reset = M234Reset;
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AddExState(&StateRegs, ~0, 0, 0);
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GameStateRestore = StateRestore;
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}
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