2012-12-14 18:18:20 +01:00
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2012 CaH4e3
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2016-09-18 05:43:24 +02:00
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* Copyright (C) 2002 Xodnizel
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2012-12-14 18:18:20 +01:00
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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;
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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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{ 0 }
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};
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static void Sync(void) {
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setprg8(0x6000, 0xF);
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setprg8(0x8000, 0x8);
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setprg8(0xa000, 0x9);
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setprg8(0xc000, reg);
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setprg8(0xe000, 0xB);
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setchr8(0);
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}
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static DECLFW(M50Write) {
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switch (A & 0xD160) {
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case 0x4120: IRQa = V & 1; if (!IRQa) IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0x4020: reg = ((V & 1) << 2) | ((V & 2) >> 1) | ((V & 4) >> 1) | (V & 8); Sync(); break;
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}
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}
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static void M50Power(void) {
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reg = 0;
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Sync();
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SetReadHandler(0x6000, 0xffff, CartBR);
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SetWriteHandler(0x4020, 0x5fff, M50Write);
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}
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static void M50Reset(void) {
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}
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static void M50IRQHook(int a) {
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if (IRQa) {
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if (IRQCount < 4096)
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IRQCount += a;
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else{
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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 StateRestore(int version) {
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Sync();
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}
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void Mapper50_Init(CartInfo *info) {
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info->Reset = M50Reset;
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info->Power = M50Power;
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MapIRQHook = M50IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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