126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/* FCEUmm - 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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 *WRAM = NULL;
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static uint32 WRAMSIZE;
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static uint16 addrlatch;
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static uint8 datalatch;
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static void Sync(void) {
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uint32 S = addrlatch & 1;
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uint32 p = ((addrlatch >> 2) & 0x1F) + ((addrlatch & 0x100) >> 3) + ((addrlatch & 0x400) >> 4);
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uint32 L = (addrlatch >> 9) & 1;
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uint32 p_8000 = p;
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if ((addrlatch >> 11) & 1)
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p_8000 = (p & 0x7E) | (datalatch & 7);
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if ((addrlatch >> 7) & 1) {
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if (S) {
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setprg32(0x8000, p >> 1);
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} else {
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setprg16(0x8000, p_8000);
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setprg16(0xC000, p);
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}
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} else {
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if (S) {
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if (L) {
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setprg16(0x8000, p_8000 & 0x7E);
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setprg16(0xC000, p | 7);
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} else {
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setprg16(0x8000, p_8000 & 0x7E);
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setprg16(0xC000, p & 0x78);
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}
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} else {
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if (L) {
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setprg16(0x8000, p_8000);
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setprg16(0xC000, p | 7);
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} else {
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setprg16(0x8000, p_8000);
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setprg16(0xC000, p & 0x78);
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}
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}
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}
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if ((addrlatch & 0x80) == 0x80)
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/* CHR-RAM write protect hack, needed for some multicarts */
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SetupCartCHRMapping(0, CHRptr[0], 0x2000, 0);
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else
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SetupCartCHRMapping(0, CHRptr[0], 0x2000, 1);
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setmirror(((addrlatch >> 1) & 1) ^ 1);
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setchr8(0);
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setprg8r(0x10, 0x6000, 0);
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}
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static DECLFR(M375Read) {
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return CartBR(A);
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}
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static DECLFW(M375Write) {
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if (addrlatch & 0x800)
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datalatch = V;
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else {
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addrlatch = A;
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datalatch = V;
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}
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Sync();
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}
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static void M375Reset(void) {
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addrlatch = 0;
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datalatch = 0;
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Sync();
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}
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static void M375Power(void) {
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addrlatch = 0;
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datalatch = 0;
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Sync();
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setchr8(0);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M375Write);
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if (WRAMSIZE) {
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SetReadHandler(0x6000, 0xFFFF, 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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}
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static void StateRestore(int version) {
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Sync();
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}
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void Mapper375_Init(CartInfo *info) {
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info->Power = M375Power;
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info->Reset = M375Reset;
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GameStateRestore = StateRestore;
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AddExState(&addrlatch, 2, 0, "ADDR");
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AddExState(&datalatch, 1, 0, "DATA");
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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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}
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