81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* 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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/* NES 2.0 Mapper 274 is used for the 90-in-1 Hwang Shinwei multicart.
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* Its UNIF board name is BMC-80013-B.
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* https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_274 */
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/* 2020-03-22 - Update support for Cave Story II, FIXME: Arabian does not work for some reasons... */
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#include "mapinc.h"
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#include "../ines.h"
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static uint8 regs[2], mode;
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static SFORMAT StateRegs[] =
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{
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{ ®s[0], 1, "REG0" },
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{ ®s[1], 1, "REG1" },
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{ &mode, 1, "MODE" },
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{ 0 }
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};
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static void Sync(void) {
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if (mode & 0x02)
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setprg16(0x8000, (regs[0] & 0x0F) | (regs[1] & 0x70));
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else
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setprg16(0x8000, (regs[0] & ((ROM_size - 1) & 0x0F)) | 0x80);
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setprg16(0xC000, regs[1]);
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setmirror(((regs[0] >> 4) & 1) ^ 1);
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}
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static DECLFW(BMC80013BWrite) {
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uint8 reg = (A >> 13) & 0x03;
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if (!reg)
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regs[0] = V & 0x1F;
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else {
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regs[1] = V & 0x7F;
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mode = reg;
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}
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Sync();
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}
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static void BMC80013BPower(void) {
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Sync();
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setchr8(0);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, BMC80013BWrite);
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}
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static void BMC80013BReset(void) {
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regs[0] = regs[1] = mode = 0;
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Sync();
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}
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static void BMC80013BRestore(int version) {
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Sync();
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}
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void BMC80013B_Init(CartInfo *info) {
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info->Power = BMC80013BPower;
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info->Reset = BMC80013BReset;
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GameStateRestore = BMC80013BRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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