89 lines
2.4 KiB
C
89 lines
2.4 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 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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#include "mapinc.h"
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#include "mmc3.h"
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writefunc writePPU;
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static uint8 *CHRRAM;
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static uint32 CHRRAMSIZE;
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static uint8 mask;
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static uint8 compare;
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extern uint32 RefreshAddr;
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static void Mapper195_CHRWrap(uint32 A, uint8 V) {
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if ((V &mask) ==compare)
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setchr1r(0x10, A, V);
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else
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setchr1r(0, A, V);
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}
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static const uint8 compares[8] = { 0x28, 0x00, 0x4C, 0x64, 0x46, 0x7C, 0x04, 0xFF };
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static DECLFW(Mapper195_InterceptPPUWrite) {
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if (RefreshAddr <0x2000) {
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int addr =RefreshAddr;
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int reg, bank;
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if (MMC3_cmd &0x80) addr ^=0x1000;
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if (addr <0x1000)
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reg =addr >>11;
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else
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reg =(addr >>10) -2;
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bank =DRegBuf[reg];
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if (bank &0x80) {
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if (bank &0x10) {
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mask =0x00;
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compare =0xFF;
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} else {
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int index =(bank &0x02? 1: 0) | (bank &0x08? 2: 0) | (bank &0x40? 4: 0);
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mask =bank &0x40? 0xFE: 0xFC;
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compare =compares[index];
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}
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FixMMC3CHR(MMC3_cmd);
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}
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}
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writePPU(A, V);
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}
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static void Mapper195_Power(void) {
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mask =0xFC;
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compare =0x00;
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GenMMC3Power();
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setprg4r(0x10, 0x5000, 2);
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SetWriteHandler(0x5000, 0x5FFF, CartBW);
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SetReadHandler(0x5000, 0x5FFF, CartBR);
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if (GetWriteHandler(0x2007) !=Mapper195_InterceptPPUWrite) {
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writePPU =GetWriteHandler(0x2007);
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SetWriteHandler(0x2007, 0x2007, Mapper195_InterceptPPUWrite);
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}
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}
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void Mapper195_Init(CartInfo *info) {
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GenMMC3_Init(info, 512, 256, 16, info->battery);
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cwrap = Mapper195_CHRWrap;
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info->Power = Mapper195_Power;
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info->Reset = MMC3RegReset;
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CHRRAMSIZE =4096;
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CHRRAM =(uint8*)FCEU_gmalloc(CHRRAMSIZE);
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SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
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AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
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}
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