97 lines
2.2 KiB
C
97 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) 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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#include "cartram.h"
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static uint8 reg[2];
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static uint8 chr;
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static void sync () {
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setprg8r(0x10, 0x6000, 0);
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if (reg[1] &0x04)
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setprg32(0x8000, reg[0]);
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else {
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setprg16(0x8000, reg[0]);
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setprg16(0xC000, 0);
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}
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setchr4(0x0000, reg[1] &0x02? chr: 0);
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setchr4(0x1000, 1);
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setmirror(reg[1] &0x01? MI_H: MI_V);
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}
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static void FP_FASTAPASS(1) trapPPUAddressChange (uint32 A) {
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if (A &0x2000 && (A &0x23C0) < 0x23C0) {
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chr = A >>(10 +(reg[1] &0x01? 1: 0)) &1;
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setchr4(0x0000, reg[1] &0x02? chr: 0);
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}
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}
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static DECLFR (readReg) {
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switch(A >>8 &7) {
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case 3: /* LPC state */
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return 0x8F;
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case 6: /* FDC */
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return 0x00;
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default:
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return X.DB;
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}
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}
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static DECLFW (writeReg) {
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switch(A >>8 &7) {
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case 0: case 2:
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reg[A >>9 &1] = V;
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sync();
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break;
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case 3: /* LPC data */
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break;
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case 5: /* FDC */
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break;
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}
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}
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static void reset () {
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reg[0] = reg[1] = chr = 0;
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sync();
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}
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static void power () {
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SetReadHandler(0x5000, 0x5FFF, readReg);
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x5000, 0x5FFF, writeReg);
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SetWriteHandler(0x6000, 0xFFFF, CartBW);
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reset();
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}
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static void restore (int version) {
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sync();
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}
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void Mapper518_Init (CartInfo *info) {
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WRAM_init(info, 8);
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info->Power = power;
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info->Reset = reset;
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GameStateRestore = restore;
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PPU_hook = trapPPUAddressChange;
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AddExState(reg, 2, 0, "REGS");
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AddExState(&chr, 1, 0, "CHRB");
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}
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