112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
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/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2022 negativeExponent
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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;
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static uint8 smb2j_reg;
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static uint8 IRQa;
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static uint16 IRQCount;
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static void Sync(void) {
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if (reg & 8) {
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uint8 prg = ((reg >> 5) & 1) | ((reg >> 6) & 2) | ((reg >> 1) & 4);
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switch ((reg >> 6) & 3) {
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case 0:
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setprg8(0x8000, prg << 1);
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setprg8(0xA000, prg << 1);
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setprg8(0xC000, prg << 1);
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setprg8(0xE000, prg << 1);
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break;
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case 1:
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setprg16(0x8000, prg);
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setprg16(0xC000, prg);
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break;
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case 2:
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case 3:
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setprg32(0x8000, prg >> 1);
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break;
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}
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} else {
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setprg8(0x8000, 0x0);
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setprg8(0xA000, 0x1);
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setprg8(0xC000, smb2j_reg);
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setprg8(0xE000, 0x3);
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}
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setprg8(0x6000, 0x7);
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setchr8((reg >> 1) & 3);
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setmirror(((reg >> 2) & 1) ^ 1);
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}
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static DECLFW(M416Write4) {
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switch (A & 0xD160) {
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case 0x4120:
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IRQa = V & 1;
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if (!IRQa)
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IRQCount = 0;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 0x4020:
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smb2j_reg = ((V & 1) << 2) | ((V & 6) >> 1);
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Sync();
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break;
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}
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}
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static DECLFW(M416Write8) {
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reg = V;
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Sync();
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}
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static void M416Power(void) {
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reg = smb2j_reg = IRQa = IRQCount = 0;
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Sync();
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x4020, 0x5FFF, M416Write4);
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SetWriteHandler(0x8000, 0x8000, M416Write8);
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}
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static void FP_FASTAPASS(1) M416IRQHook(int a) {
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if (IRQa) {
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if (IRQCount < 4096)
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IRQCount += a;
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else {
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IRQa = 0;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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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 Mapper416_Init(CartInfo *info) {
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info->Power = M416Power;
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MapIRQHook = M416IRQHook;
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GameStateRestore = StateRestore;
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AddExState(®, 1, 0, "REGS");
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AddExState(&smb2j_reg, 1, 0, "SMBJ");
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AddExState(&IRQa, 1, 0, "IRQa");
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AddExState(&IRQCount, 2, 0, "IRQC");
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}
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