105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
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/* 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 uint32 pcmAddress, pcmAddressMask;
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static uint8 pcmControl;
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static uint8 scanlineCounter;
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static uint8 scanlineReload;
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static uint8 scanlineIRQ;
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static uint32 lasttime;
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extern uint32 timestamp;
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static SFORMAT stateRegs[] ={
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{ reg, 4, "REGS" },
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{ &pcmAddress, 4, "PCMA" },
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{ &pcmControl, 1, "PCMC" },
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{ &scanlineCounter, 1, "SLCN" },
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{ &scanlineReload, 1, "SLRL" },
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{ &scanlineIRQ, 1, "SLEN" },
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{ 0 }
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};
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static void sync() {
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setprg4(0x5000, 1);
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setprg8(0x6000, reg[0]);
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setprg8(0x8000, reg[1]);
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setprg8(0xA000, reg[2]);
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setprg4(0xD000, 7);
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setprg8(0xE000, 4);
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setchr4(0x0000, reg[3]);
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setchr4(0x1000, ~2);
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}
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static DECLFR(readPCM) {
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uint8 result =MiscROM[pcmAddress &pcmAddressMask];
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if (timestamp <lasttime || timestamp >(lasttime +6)) {
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if (pcmControl &2) ++pcmAddress;
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lasttime =timestamp;
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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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switch(A >>12 &7) {
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case 0: scanlineReload =V;
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break;
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case 1: scanlineCounter =0;
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break;
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case 2: scanlineIRQ =0;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 3: scanlineIRQ =1;
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break;
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case 4: pcmAddress =pcmAddress <<1 | V >>7;
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break;
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case 5: pcmControl =V;
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break;
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case 6:
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case 7: reg[V >>6] =V &0x3F;
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sync();
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break;
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}
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}
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static void horizontalBlanking () {
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scanlineCounter =!scanlineCounter? scanlineReload: --scanlineCounter;
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if (!scanlineCounter && scanlineIRQ) X6502_IRQBegin(FCEU_IQEXT);
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}
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static void power (void) {
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pcmAddress =pcmControl =lasttime =0;
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scanlineCounter =scanlineReload =scanlineIRQ =0;
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sync();
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SetReadHandler(0x5000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, writeReg);
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SetReadHandler(0xC000, 0xCFFF, readPCM);
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}
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void Mapper413_Init(CartInfo *info) {
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pcmAddressMask =info->miscROMSize -1;
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GameStateRestore =sync;
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GameHBIRQHook =horizontalBlanking;
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info->Power = power;
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AddExState(stateRegs, ~0, 0, 0);
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}
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