138 lines
3.0 KiB
C
138 lines
3.0 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) 2022
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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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* NES 2.0 Mapper 330 is used for a bootleg version of Contra/Gryzor.
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* as implemented from
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* http://forums.nesdev.org/viewtopic.php?f=9&t=17352&p=218722#p218722
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*/
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#include "mapinc.h"
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static uint8 *WRAM;
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static uint8 PRG[3], CHR[8], NTAPage[4];
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static uint8 IRQa;
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static uint16 IRQCount;
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static SFORMAT StateRegs[] =
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{
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{ PRG, 3, "PRG" },
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{ CHR, 8, "CHR" },
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{ NTAPage, 4, "NT" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 2, "IRQC" },
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{ 0 }
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};
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static void SyncPRG(void) {
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setprg8(0x8000, PRG[0]);
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setprg8(0xA000, PRG[1]);
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setprg8(0xC000, PRG[2]);
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setprg8(0xE000, ~0);
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}
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static void DoCHR(int x, uint8 V) {
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CHR[x] = V;
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setchr1(x << 10, V);
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}
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static void FixCHR(void) {
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int x;
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for (x = 0; x < 8; x++)
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DoCHR(x, CHR[x]);
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}
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static void FASTAPASS(2) DoNTARAM(int w, uint8 V) {
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NTAPage[w] = V;
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setntamem(NTARAM + ((V & 1) << 10), 1, w);
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}
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static void FixNTAR(void) {
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int x;
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for (x = 0; x < 4; x++)
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DoNTARAM(x, NTAPage[x]);
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}
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static DECLFW(M330Write) {
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if (!(A & 0x400)) {
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if (A >= 0x8000 && A <= 0xB800)
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DoCHR((A - 0x8000) >> 11, V);
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else if (A >= 0xC000 && A <= 0xD800)
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DoNTARAM((A - 0xC000) >> 11, V);
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else if (A >= 0xE000 && A <= 0xF000) {
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PRG[(A - 0xE000) >> 11] = V;
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SyncPRG();
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}
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} else if ((A < 0xC000) && !(A & 0x4000)) {
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if (A & 0x2000) {
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IRQCount &= 0x00FF;
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IRQCount |= (V & 0x7F) << 8;
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IRQa = V & 0x80;
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X6502_IRQEnd(FCEU_IQEXT);
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} else {
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IRQCount &= 0xFF00;
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IRQCount |= V;
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}
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}
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}
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static void M330Power(void) {
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int i;
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for (i = 0; i < 4; i++)
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PRG[i] = i;
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for (i = 0; i < 8; i++)
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CHR[i] = i;
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for (i = 0; i < 4; i++)
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NTAPage[i] = ~0;
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IRQa = 0;
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IRQCount = 0;
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SyncPRG();
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FixCHR();
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FixNTAR();
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M330Write);
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}
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static void FP_FASTAPASS(1) M330IRQHook(int a) {
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if (IRQa) {
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IRQCount += a;
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if (IRQCount > 0x7FFF) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa = 0;
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IRQCount = 0;
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}
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}
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}
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static void StateRestore(int version) {
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SyncPRG();
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FixCHR();
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FixNTAR();
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}
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void Mapper330_Init(CartInfo *info) {
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info->Power = M330Power;
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MapIRQHook = M330IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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WRAM = (uint8 *)FCEU_gmalloc(8192);
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SetupCartPRGMapping(0x10, WRAM, 8192, 1);
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AddExState(WRAM, 8192, 0, "WRAM");
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}
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