mirror of
https://github.com/dborth/fceugx.git
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85 lines
2.1 KiB
C++
85 lines
2.1 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 mram[4], vreg;
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static uint16 areg;
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static SFORMAT StateRegs[] =
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{
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{ mram, 4, "MRAM" },
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{ &areg, 2, "AREG" },
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{ &vreg, 1, "VREG" },
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{ 0 }
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};
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static void Sync(void) {
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uint32 prgl, prgh, page = (areg >> 7) & 0x3F;
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if ((page & 0x30) == 0x30)
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page -= 0x10;
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prgl = prgh = (page << 1) + (((areg >> 6) & 1) & ((areg >> 5) & 1));
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prgh += ((areg >> 5) & 1) ^ 1;
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setmirror(((areg >> 13) & 1) ^ 1);
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setprg16(0x8000,prgl);
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setprg16(0xc000,prgh);
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setchr8(((vreg & 0x3) | ((areg & 0xF) << 2)));
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}
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static DECLFW(M228RamWrite) {
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mram[A & 3] = V & 0x0F;
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}
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static DECLFR(M228RamRead) {
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return mram[A & 3];
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}
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static DECLFW(M228Write) {
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areg = A;
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vreg = V;
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Sync();
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}
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static void M228Reset(void) {
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areg = 0x8000;
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vreg = 0;
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Sync();
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}
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static void M228Power(void) {
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M228Reset();
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SetReadHandler(0x5000,0x5FFF,M228RamRead);
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SetWriteHandler(0x5000,0x5FFF,M228RamWrite);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M228Write);
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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 Mapper228_Init(CartInfo *info) {
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info->Reset = M228Reset;
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info->Power = M228Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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