mirror of
https://github.com/dborth/fceugx.git
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97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
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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) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* Super Mario Bros 2 J alt version
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* as well as "Voleyball" FDS conversion, bank layot is similar but no bankswitching and CHR ROM present
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*/
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#include "mapinc.h"
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static uint8 prg, IRQa;
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static uint16 IRQCount;
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static SFORMAT StateRegs[]=
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{
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{&prg, 1, "PRG"},
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{&IRQa, 1, "IRQA"},
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{&IRQCount, 2, "IRQC"},
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{0}
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};
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static void Sync(void)
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{
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setprg4r(1,0x5000,1);
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setprg8r(1,0x6000,1);
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setprg32(0x8000,prg);
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setchr8(0);
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}
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static DECLFW(UNLSMB2JWrite)
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{
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if(A==0x4022)
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{
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prg=V&1;
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Sync();
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}
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if(A==0x4122)
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{
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IRQa=V;
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IRQCount=0;
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X6502_IRQEnd(FCEU_IQEXT);
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}
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}
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static void UNLSMB2JPower(void)
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{
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prg=~0;
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Sync();
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SetReadHandler(0x5000,0x7FFF,CartBR);
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x4020,0xffff,UNLSMB2JWrite);
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}
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static void UNLSMB2JReset(void)
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{
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prg=~0;
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Sync();
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}
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static void UNLSMB2JIRQHook(int a)
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{
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if(IRQa)
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{
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IRQCount+=a*3;
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if((IRQCount>>12)==IRQa)
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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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{
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Sync();
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}
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void UNLSMB2J_Init(CartInfo *info)
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{
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info->Reset=UNLSMB2JReset;
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info->Power=UNLSMB2JPower;
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MapIRQHook=UNLSMB2JIRQHook;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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