83 lines
1.9 KiB
C
83 lines
1.9 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) 2025 NewRisingSun
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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 "asic_vrc2and4.h"
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#include "wram.h"
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static uint8 reg;
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static uint8 dip;
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static SFORMAT Mapper447_stateRegs[] ={
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{ ®, 1, "EXP0" },
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{ &dip, 1, "DIPS" },
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{ 0 }
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};
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static void sync () {
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VRC24_syncPRG(0x0F, reg <<4);
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VRC24_syncCHR(0x7F, reg <<7);
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VRC24_syncMirror();
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VRC24_syncWRAM(0);
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}
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static int Mapper447_getPRGBank(uint8 bank) {
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if (reg &4) {
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if (~reg &2)
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return VRC24_getPRGBank(bank &1) &~2 | bank &2;
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else
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return VRC24_getPRGBank(bank &1);
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} else
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return VRC24_getPRGBank(bank);
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}
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DECLFR(Mapper447_readPRG) {
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return CartBR(reg &8? (A &~3 | dip &3): A);
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}
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DECLFW(Mapper447_writeReg) {
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if (~reg &1) {
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reg =A &0xFF;
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sync();
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}
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CartBW(A, V);
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}
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void Mapper447_power(void) {
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reg =0;
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dip =0;
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VRC24_power();
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SetReadHandler(0x8000, 0xFFFF, Mapper447_readPRG);
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}
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void Mapper447_reset(void) {
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reg =0;
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dip++;
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sync();
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}
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void Mapper447_Init (CartInfo *info) {
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VRC4_init(info, sync, 0x04, 0x08, 0, Mapper447_getPRGBank, NULL, NULL, Mapper447_writeReg, NULL );
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WRAM_init(info, 2);
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info->Power =Mapper447_power;
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info->Reset =Mapper447_reset;
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AddExState(Mapper447_stateRegs, ~0, 0, 0);
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}
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