92 lines
2.6 KiB
C++
92 lines
2.6 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) 2006 CaH4e3
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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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* FDS Conversion
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*
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*/
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#include "mapinc.h"
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static uint8 reg, swap;
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static uint32 IRQCount, IRQa;
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static SFORMAT StateRegs[] =
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{
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{ &IRQCount, 4, "IRQC" },
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{ &IRQa, 4, "IRQA" },
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{ ®, 1, "REG" },
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{ &swap, 1, "SWAP" },
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{ 0 }
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};
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static void Sync(void) {
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setprg4(0x5000, 8 << 1); // Only YS-612 advanced version
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setprg8(0x6000, swap?0:2);
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setprg8(0x8000, 1);
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setprg8(0xa000, 0);
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setprg8(0xc000, reg);
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setprg8(0xe000, swap?8:9); // hard dump for mr.Mary is 128K,
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// bank 9 is the last 2K ok bank 8 repeated 4 times, then till the end of 128K
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// instead used bank A, containing some CHR data, ines rom have unused banks removed,
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// and bank A moved to the bank 9 place for compatibility with other crappy dumps
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setchr8(0);
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}
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static DECLFW(M43Write) {
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// int transo[8]={4,3,4,4,4,7,5,6};
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int transo[8] = { 4, 3, 5, 3, 6, 3, 7, 3 }; // According to hardware tests
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switch (A & 0xf1ff) {
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case 0x4022: reg = transo[V & 7]; Sync(); break;
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case 0x4120: swap = V & 1; Sync(); break;
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case 0x8122: // hacked version
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case 0x4122: IRQa = V & 1; X6502_IRQEnd(FCEU_IQEXT); IRQCount = 0; break; // original version
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}
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}
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static void M43Power(void) {
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reg = swap = 0;
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Sync();
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SetReadHandler(0x5000, 0xffff, CartBR);
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SetWriteHandler(0x4020, 0xffff, M43Write);
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}
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static void M43Reset(void) {
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}
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static void M43IRQHook(int a) {
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IRQCount += a;
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if (IRQa)
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if (IRQCount >= 4096) {
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IRQa = 0;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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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 Mapper43_Init(CartInfo *info) {
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info->Reset = M43Reset;
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info->Power = M43Power;
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MapIRQHook = M43IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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