99 lines
2.3 KiB
C
99 lines
2.3 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 326 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 PRG[3], CHR[8], NTAPage[4];
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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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{ 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(M326Write) {
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switch (A & 0xE010) {
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case 0x8000: PRG[0] = V; SyncPRG(); break;
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case 0xA000: PRG[1] = V; SyncPRG(); break;
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case 0xC000: PRG[2] = V; SyncPRG(); break;
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}
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A &= 0x801F;
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if ((A >= 0x8010) && (A <= 0x8017))
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DoCHR(A - 0x8010, V);
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else if ((A >= 0x8018) && (A <= 0x801B))
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DoNTARAM(A - 0x8018, V);
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}
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static void M326Power(void) {
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SyncPRG();
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FixCHR();
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FixNTAR();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M326Write);
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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 Mapper326_Init(CartInfo *info) {
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info->Power = M326Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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