99 lines
2.3 KiB
C
99 lines
2.3 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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static uint8 reg[4];
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static readfunc read4016 =NULL;
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static SFORMAT stateRegs[] ={
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{ ®, 2, "REGS" },
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{ 0 }
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};
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static void sync () {
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if (reg[2] &4)
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setprg32(0x8000, reg[0]);
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else {
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setprg16(0x8000, reg[0]);
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setprg16(0xC000, reg[0]);
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}
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setchr8(0);
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setmirror(reg[2] &1? MI_H: MI_V);
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}
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static DECLFR(remapButtons) {
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int i;
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uint8 result =0x40;
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GetWriteHandler(0x4016)(0x4016, 1);
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GetWriteHandler(0x4016)(0x4016, 0);
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if (A ==0x4016) {
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for (i =0; i <8; i++) {
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result <<=1;
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result |=read4016(0x4016) &1;
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}
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result =(result &0x90? 0x01: 0x00) | /* START/A */
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(result &0x60? 0x02: 0x00) ; /* SELECT/B */
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} else
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if (A ==0x4017) {
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int i;
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for (i =0; i <8; i++) {
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result <<=1;
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result |=read4016(0x4016) &1;
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}
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result =(result &0x04? 0x08: 0x00) | /* DOWN */
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(result &0x08? 0x02: 0x00) | /* UP */
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(result &0x02? 0x04: 0x00) | /* LEFT */
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(result &0x01? 0x10: 0x00) /* RIGHT */
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;
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}
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return result;
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}
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static DECLFW(writeReg) {
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reg[A >>8 &3] =V;
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sync();
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}
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static void reset(void) {
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reg[0] =reg[1] =reg[2] =reg[3] =0;
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sync();
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}
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static void power(void) {
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if (read4016 !=&remapButtons) read4016 =GetReadHandler(0x4016);
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reset();
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SetReadHandler(0x4016, 0x4017, remapButtons);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x5000, 0x5FFF, writeReg);
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}
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static void close(void) {
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read4016 =NULL;
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}
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void Mapper476_Init(CartInfo *info) {
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AddExState(stateRegs, ~0, 0, 0);
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info->Power =power;
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info->Reset =reset;
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info->Close =close;
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}
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