80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
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/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright (C) 2019 Libretro Team
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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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/* added 2019-5-23
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* Mapper 255
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* https://wiki.nesdev.com/w/index.php/INES_Mapper_225
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* 115-in-1 [p1][!] CRC32 0xb39d30b4
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* Seems to handle up to last game in the multicarts than m225 but causes
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* graphics garbage past it, else games works fine */
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#include "mapinc.h"
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static uint8 preg, creg, mode, mirr;
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static SFORMAT StateRegs[] =
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{
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{ &preg, 1, "PRG0" },
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{ &creg, 1, "CHR0" },
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{ &mode, 1, "MODE" },
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{ &mirr, 1, "MIRR" },
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{ 0 }
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};
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static void Sync(void) {
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setprg16(0x8000, preg & ~mode);
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setprg16(0xC000, preg | mode);
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setchr8(creg);
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setmirror(mirr ^ 1);
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}
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static DECLFW(M255Write) {
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uint32 bank = (A >> 8 & 0x40);
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preg = bank | ((A >> 6) & 0x3F);
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creg = bank | (A & 0x3F);
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mirr = (A >> 13) & 1;
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mode = ((~A) >> 12 & 1);
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Sync();
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}
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static void M255Power(void) {
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preg = 0;
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mode = 1;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M255Write);
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}
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static void M255Reset(void) {
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preg = 0;
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mode = 1;
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Sync();
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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 Mapper255_Init(CartInfo *info) {
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info->Reset = M255Reset;
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info->Power = M255Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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