92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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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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/* Mapper 237 - "Teletubbies / Y2K" 420-in-1 pirate multicart.
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* Dipswitch settings:
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* 0: 42-in-1
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* 1: 5,000-in-1
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* 2: 420-in-1
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* 3: 10,000,000-in-1 (lol)
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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 dipswitch;
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static SFORMAT StateRegs[] =
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{
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{ ®[0], 1, "REG0" },
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{ ®[1], 1, "REG1" },
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{ &dipswitch, 1, "DPSW" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 bank = (reg[1] & 0x07);
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uint8 base = (reg[1] & 0x18) | ((reg[0] & 0x04) << 3);
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uint8 mode = (reg[1] & 0xC0) >> 6;
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setchr8(0);
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setprg16(0x8000, base | (bank & ~(mode & 1)));
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setprg16(0xC000, base | ((mode & 0x02) ? (bank | (mode & 0x01)) : 0x07));
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setmirror(((reg[1] & 0x20) >> 5) ^ 1);
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}
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static DECLFW(M237Write) {
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if (!(reg[0] & 0x02)) {
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reg[0] = A & 0x0F;
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reg[1] = (reg[1] & 0x07) | (V & 0xF8);
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}
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reg[1] = (reg[1] & 0xF8) | (V & 0x07);
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Sync();
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}
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static DECLFR(M237Read) {
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if (!(reg[0] & 0x02) && (reg[0] & 0x01))
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return dipswitch;
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return CartBR(A);
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}
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static void M237Power(void) {
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Sync();
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SetReadHandler (0x8000, 0xFFFF, M237Read);
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SetWriteHandler(0x8000, 0xFFFF, M237Write);
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}
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static void M237Reset(void) {
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reg[0] = reg[1] = 0;
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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 Mapper237_Init(CartInfo *info) {
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dipswitch = 0;
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if ((info->CRC32) == 0x272709b9) /* Teletubbies Y2K (420-in-1) */
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dipswitch = 2;
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info->Power = M237Power;
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info->Reset = M237Reset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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