87 lines
2.0 KiB
C
87 lines
2.0 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) 2005 CaH4e3
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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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*/
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#include "mapinc.h"
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static uint8 reg[2];
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static uint8 latch;
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static uint8 pad;
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static SFORMAT StateRegs[] =
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{
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{ reg, 2, "REG" },
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{ &latch, 1, "LATC" },
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{ &pad, 1, "PAD" },
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{ 0 }
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};
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static void M319Sync (void) {
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if (reg[1] &0x40)
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setprg32(0x8000, reg[1] >>3 &3);
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else
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{
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setprg16(0x8000, reg[1] >>2 &6 | reg[1] >>5 &1);
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setprg16(0xC000, reg[1] >>2 &6 | reg[1] >>5 &1);
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}
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setchr8(reg[0] >>4 &~(reg[0] <<2 &4) | latch <<2 &(reg[0] <<2 &4));
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setmirror(reg[1] >>7);
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}
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static void StateRestore(int version) {
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M319Sync();
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}
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static DECLFR(M319ReadPad) {
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return pad;
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}
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static DECLFW(M319WriteReg) {
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reg[A >>2 &1] =V;
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M319Sync();
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}
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static DECLFW(M319WriteLatch) {
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latch =V;
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M319Sync();
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}
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static void M319Reset(void) {
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reg[0] =reg[1] =latch =0;
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pad ^=0x40;
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M319Sync();
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}
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static void M319Power(void) {
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reg[0] =reg[1] =latch =pad =0;
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M319Sync();
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SetReadHandler(0x5000, 0x5FFF, M319ReadPad);
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, M319WriteReg);
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SetWriteHandler(0x8000, 0xFFFF, M319WriteLatch);
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}
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void Mapper319_Init(CartInfo *info) {
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info->Power = M319Power;
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info->Reset = M319Reset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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