100 lines
2.6 KiB
C
100 lines
2.6 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) 2020 negativeExponent
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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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/* NES 2.0 Mapper 269
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* Games Xplosion 121-in-1
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* 15000-in-1
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* 18000-in-1
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 *CHRROM;
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static uint32 CHRROMSIZE;
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static void M269CW(uint32 A, uint8 V) {
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uint16 NV = V;
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if (EXPREGS[2] & 8)
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NV &= (1 << ((EXPREGS[2] & 7) + 1)) - 1;
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NV |= EXPREGS[0] | ((EXPREGS[2] & 0xF0) << 4);
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setchr1(A, NV);
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}
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static void M269PW(uint32 A, uint8 V) {
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uint16 MV = V & ((EXPREGS[3] & 0x3F) ^ 0x3F);
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MV |= EXPREGS[1];
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MV |= ((EXPREGS[3] & 0x40) << 2);
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setprg8(A, MV);
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}
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static DECLFW(M269Write5) {
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if (!(EXPREGS[3] & 0x80)) {
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EXPREGS[EXPREGS[4]] = V;
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EXPREGS[4] = (EXPREGS[4] + 1) & 3;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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}
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static void M269Close(void) {
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GenMMC3Close();
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if (CHRROM)
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FCEU_free(CHRROM);
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CHRROM = NULL;
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}
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static void M269Reset(void) {
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EXPREGS[0] = EXPREGS[1] = EXPREGS[3] = EXPREGS[4] = 0;
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EXPREGS[2] = 0x0F;
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MMC3RegReset();
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}
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static void M269Power(void) {
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EXPREGS[0] = EXPREGS[1] = EXPREGS[3] = EXPREGS[4] = 0;
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EXPREGS[2] = 0x0F;
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GenMMC3Power();
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SetWriteHandler(0x5000, 0x5FFF, M269Write5);
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}
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static uint8 unscrambleCHR(uint8 data) {
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return ((data & 0x01) << 6) | ((data & 0x02) << 3) | ((data & 0x04) << 0) | ((data & 0x08) >> 3) |
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((data & 0x10) >> 3) | ((data & 0x20) >> 2) | ((data & 0x40) >> 1) | ((data & 0x80) << 0);
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}
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void Mapper269_Init(CartInfo *info) {
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uint32 i;
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GenMMC3_Init(info, 512, 0, 8, 0);
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cwrap = M269CW;
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pwrap = M269PW;
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info->Power = M269Power;
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info->Reset = M269Reset;
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info->Close = M269Close;
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AddExState(EXPREGS, 5, 0, "EXPR");
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CHRROMSIZE = PRGsize[0];
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CHRROM = (uint8*)FCEU_gmalloc(CHRROMSIZE);
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/* unscramble CHR data from PRG */
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for (i = 0; i < CHRROMSIZE; i++)
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CHRROM[i] = unscrambleCHR(PRGptr[0][i]);
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SetupCartCHRMapping(0, CHRROM, CHRROMSIZE, 0);
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AddExState(CHRROM, CHRROMSIZE, 0, "_CHR");
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}
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