89 lines
2.2 KiB
C
89 lines
2.2 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) 2022 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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*/
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#include "mapinc.h"
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static uint8 regData[2];
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static uint8 regAddr;
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static SFORMAT K1053_state[] =
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{
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{ regData, 2, "REGD" },
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{®Addr, 1, "REGA" },
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{ 0 }
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};
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static void K1053_sync (void) {
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int prg =regData[0] &0x3F | regAddr <<4 &~0x3F;
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int chrWritable;
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switch(regAddr &3) {
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case 0: setprg32(0x8000, prg >>1);
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chrWritable =0;
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break;
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case 1: setprg16(0x8000, prg);
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setprg16(0xC000, prg |7);
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chrWritable =1;
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break;
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case 2: prg =prg <<1 | regData[0] >>7;
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setprg8(0x8000, prg);
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setprg8(0xA000, prg);
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setprg8(0xC000, prg);
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setprg8(0xE000, prg);
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chrWritable =1;
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break;
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case 3: setprg16(0x8000, prg);
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setprg16(0xC000, prg);
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chrWritable =0;
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break;
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}
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SetupCartCHRMapping(0, CHRptr[0], 0x8000, chrWritable);
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setchr8(regData[1]);
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setmirror(regData[0] &0x40? MI_H: MI_V);
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}
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static void K1053_restore(int version) {
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K1053_sync();
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}
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static DECLFW(K1053_write) {
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regData[A >>14 &1] =V;
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if (A &0x4000) regAddr=A &0xFF;
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K1053_sync();
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}
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static void K1053_reset(void) {
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regData[0] =regData[1] =regAddr =0;
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K1053_sync();
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}
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static void K1053_power(void) {
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K1053_reset();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, K1053_write);
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}
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void Mapper310_Init(CartInfo *info) {
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info->Power = K1053_power;
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info->Reset = K1053_reset;
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GameStateRestore = K1053_restore;
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AddExState(&K1053_state, ~0, 0, 0);
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}
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