mirror of
https://github.com/dborth/fceugx.git
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116 lines
2.8 KiB
C++
116 lines
2.8 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) 2007 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, mirr;
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static int32 IRQa, IRQCount, IRQLatch;
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static uint8 *WRAM = NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[] =
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{
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{ &mirr, 1, "MIRR" },
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{ ®, 1, "REGS" },
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{ &IRQa, 4, "IRQA" },
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{ &IRQCount, 4, "IRQC" },
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{ &IRQLatch, 4, "IRQL" },
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{ 0 }
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};
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static void Sync(void) {
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setprg16(0x8000, reg);
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setprg16(0xC000, 2);
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setmirror(mirr);
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}
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static DECLFW(UNLKS7017Write) {
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// FCEU_printf("bs %04x %02x\n",A,V);
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if ((A & 0xFF00) == 0x4A00) {
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reg = ((A >> 2) & 3) | ((A >> 4) & 4);
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} else if ((A & 0xFF00) == 0x5100) {
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Sync();
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} else if (A == 0x4020) {
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X6502_IRQEnd(FCEU_IQEXT);
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IRQCount &= 0xFF00;
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IRQCount |= V;
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} else if (A == 0x4021) {
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X6502_IRQEnd(FCEU_IQEXT);
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IRQCount &= 0xFF;
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IRQCount |= V << 8;
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IRQa = 1;
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} else if (A == 0x4025) {
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mirr = ((V & 8) >> 3) ^ 1;
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}
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}
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static DECLFR(FDSRead4030) {
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X6502_IRQEnd(FCEU_IQEXT);
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return X.IRQlow & FCEU_IQEXT ? 1 : 0;
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}
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static void UNL7017IRQ(int a) {
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if (IRQa) {
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IRQCount -= a;
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if (IRQCount <= 0) {
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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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}
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static void UNLKS7017Power(void) {
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Sync();
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setchr8(0);
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setprg8r(0x10, 0x6000, 0);
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetReadHandler(0x4030, 0x4030, FDSRead4030);
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SetWriteHandler(0x4020, 0x5FFF, UNLKS7017Write);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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}
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static void UNLKS7017Close(void) {
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if (WRAM)
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FCEU_gfree(WRAM);
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WRAM = NULL;
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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 UNLKS7017_Init(CartInfo *info) {
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info->Power = UNLKS7017Power;
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info->Close = UNLKS7017Close;
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MapIRQHook = UNL7017IRQ;
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WRAMSIZE = 8192;
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WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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