95 lines
2.7 KiB
C
95 lines
2.7 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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static uint8 *CHRRAM =NULL;
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static DECLFR(Mapper460_ReadOB)
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{
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return X.DB;
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}
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static void Mapper460_PRGWrap(uint32 A, uint8 V) {
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int prgAND =0x0F;
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int prgOR =EXPREGS[0] <<4;
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if (EXPREGS[0] &0x20 && (EXPREGS[0] !=0x20 || ~EXPREGS[1] &1)) { /* Menu selection by selectively connecting CPU D7 to reg or not */
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if (~A &0x4000) {
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setprg8(A, (EXPREGS[0] &0x10? ~2: ~0) &V &prgAND | prgOR &~prgAND);
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setprg8(A |0x4000, (EXPREGS[0] &0x10? 2: 0) |V &prgAND | prgOR &~prgAND);
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}
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} else
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setprg8(A, V &prgAND | prgOR &~prgAND);
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/* Menu selection by selectively connecting reg's D7 to PRG /CE or not */
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if (EXPREGS[0] &0x80 && EXPREGS[1] &1)
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SetReadHandler(0x8000, 0xFFFF, Mapper460_ReadOB);
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else
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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}
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static void Mapper460_CHRWrap(uint32 A, uint8 V) {
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if (EXPREGS[0] &0x04) {
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setchr2(0x0000, DRegBuf[0] &0xFE);
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setchr2(0x0800, DRegBuf[0] |0x01);
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setchr2(0x1000, DRegBuf[2]);
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setchr2(0x1800, DRegBuf[5]);
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} else
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setchr8r(0x10, 0);
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}
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static DECLFW(Mapper460_WriteExtra) {
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if (A001B &0x80 && ~A001B &0x40) EXPREGS[0] =A &0xFF;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static void Mapper460_Reset(void) {
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EXPREGS[0] =0;
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EXPREGS[1]++;
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MMC3RegReset();
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}
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static void Mapper460_Power(void) {
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EXPREGS[0] =0;
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EXPREGS[1] =0;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, Mapper460_WriteExtra);
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}
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static void Mapper460_close(void) {
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if (CHRRAM) FCEU_gfree(CHRRAM);
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CHRRAM =NULL;
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}
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void Mapper460_Init(CartInfo *info) {
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GenMMC3_Init(info, 128, 512, 0, 0);
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cwrap = Mapper460_CHRWrap;
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pwrap = Mapper460_PRGWrap;
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info->Power = Mapper460_Power;
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info->Reset = Mapper460_Reset;
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info->Close = Mapper460_close;
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AddExState(EXPREGS, 2, 0, "EXPR");
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CHRRAM =(uint8 *)FCEU_gmalloc(8192);
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SetupCartCHRMapping(0x10, CHRRAM, 8192, 1);
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AddExState(CHRRAM, 8192, 0, "CRAM");
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}
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