mirror of
https://github.com/dborth/fceugx.git
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139 lines
3.4 KiB
C++
139 lines
3.4 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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* Copyright (C) 2002 Xodnizel
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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 is10;
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static uint8 creg[4], latch0, latch1, preg, mirr;
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static uint8 *WRAM = NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[] =
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{
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{ creg, 4, "CREG" },
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{ &preg, 1, "PREG" },
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{ &mirr, 1, "MIRR" },
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{ &latch0, 1, "LAT0" },
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{ &latch1, 1, "LAT1" },
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{ 0 }
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};
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static void Sync(void) {
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if (is10) {
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setprg8r(0x10, 0x6000, 0);
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setprg16(0x8000, preg);
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setprg16(0xC000, ~0);
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} else {
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setprg8(0x8000, preg);
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setprg8(0xA000, ~2);
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setprg8(0xC000, ~1);
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setprg8(0xE000, ~0);
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}
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setchr4(0x0000, creg[latch0]);
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setchr4(0x1000, creg[latch1 + 2]);
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setmirror(mirr);
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}
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DECLFW(MMC2and4Write) {
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switch (A & 0xF000) {
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case 0xA000: preg = V; Sync(); break;
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case 0xB000: creg[0] = V; Sync(); break;
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case 0xC000: creg[1] = V; Sync(); break;
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case 0xD000: creg[2] = V; Sync(); break;
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case 0xE000: creg[3] = V; Sync(); break;
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case 0xF000: mirr = (V & 1) ^ 1; Sync(); break;
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}
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}
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static void MMC2and4PPUHook(uint32 A) {
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uint8 l, h = A >> 8;
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if (h >= 0x20 || ((h & 0xF) != 0xF))
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return;
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l = A & 0xF0;
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if (h < 0x10) {
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if (l == 0xD0) {
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latch0 = 0;
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setchr4(0x0000, creg[0]);
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} else if (l == 0xE0) {
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latch0 = 1;
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setchr4(0x0000, creg[1]);
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}
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} else {
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if (l == 0xD0) {
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latch1 = 0;
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setchr4(0x1000, creg[2]);
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} else if (l == 0xE0) {
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latch1 = 1;
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setchr4(0x1000, creg[3]);
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}
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}
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}
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static void MMC2and4Power(void) {
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preg = 0;
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latch0 = latch1 = 1;
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Sync();
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if (is10) {
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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}
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0xA000, 0xFFFF, MMC2and4Write);
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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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static void MMC2and4Close(void)
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{
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if (WRAM)
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FCEU_gfree(WRAM);
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WRAM = NULL;
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}
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void Mapper9_Init(CartInfo *info) {
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is10 = 0;
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info->Power = MMC2and4Power;
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PPU_hook = MMC2and4PPUHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void Mapper10_Init(CartInfo *info) {
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is10 = 1;
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info->Power = MMC2and4Power;
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info->Close = MMC2and4Close;
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PPU_hook = MMC2and4PPUHook;
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WRAMSIZE = 8192;
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WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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if (info->battery) {
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info->SaveGame[0] = WRAM;
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info->SaveGameLen[0] = WRAMSIZE;
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}
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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