mirror of
https://github.com/dborth/fceugx.git
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148 lines
3.1 KiB
C++
148 lines
3.1 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) 2024
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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 "../ines.h"
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static uint8 reg[4];
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static uint8 IRQCount;
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static uint8 IRQReload;
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static uint8 IRQa;
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static uint8 serialControl;
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static uint32 serialAddress;
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static SFORMAT StateRegs[] = {
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{ reg, 4, "REGS" },
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{ &IRQCount, 1, "IRQC" },
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{ &IRQReload, 1, "IRQR" },
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{ &IRQa, 1, "IRQA" },
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{ &serialAddress, 4, "ADDR" },
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{ &serialControl, 1, "CTRL" },
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{ 0 }
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};
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static void Sync(void) {
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setprg4(0x5000, 0x01);
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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, 0x07);
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setprg8(0xE000, 0x04);
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setchr4(0x0000, reg[3]);
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setchr4(0x1000, ~0x02);
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}
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static uint64 lreset;
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static uint32 laddr;
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static DECLFR(M413ReadPCM) {
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uint8 ret = X.DB;
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if ((A == laddr) && ((timestampbase + timestamp) < (lreset + 4))) {
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return ret;
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}
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if (serialControl & 0x02) {
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ret = MiscROM[serialAddress++ & (MiscROM_size - 1)];
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} else {
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ret = MiscROM[serialAddress & (MiscROM_size - 1)];
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}
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laddr = A;
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lreset = timestampbase + timestamp;
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return ret;
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}
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static DECLFW(M413Write) {
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switch (A & 0xF000) {
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case 0x8000:
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IRQReload = V;
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break;
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case 0x9000:
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IRQCount = 0;
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break;
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case 0xA000:
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case 0xB000:
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IRQa = (A & 0x1000) != 0;
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if (!IRQa) {
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X6502_IRQEnd(FCEU_IQEXT);
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}
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break;
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case 0xC000:
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serialAddress = (serialAddress << 1) | (V >> 7);
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break;
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case 0xD000:
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serialControl = V;
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break;
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case 0xE000:
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case 0xF000:
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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 M413Power(void) {
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serialAddress = 0;
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serialControl = 0;
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IRQCount = 0;
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IRQReload = 0;
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IRQa = 0;
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reg[0] = 0;
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reg[1] = 0;
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reg[2] = 0;
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reg[3] = 0;
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laddr = 0;
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lreset = 0;
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Sync();
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SetReadHandler(0x4800, 0x4FFF, M413ReadPCM);
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SetReadHandler(0x5000, 0x7FFF, CartBR);
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SetReadHandler(0x8000, 0xBFFF, CartBR);
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SetReadHandler(0xC000, 0xCFFF, M413ReadPCM);
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SetReadHandler(0xD000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M413Write);
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}
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static void M413IRQHook(void) {
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if (IRQCount == 0) {
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IRQCount = IRQReload;
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} else {
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IRQCount--;
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}
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if ((IRQCount == 0) && IRQa) {
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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static void StateRestore(int version) {
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Sync();
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}
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void Mapper413_Init(CartInfo *info) {
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info->Power = M413Power;
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GameHBIRQHook = M413IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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