mirror of
https://github.com/dborth/fceugx.git
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125 lines
2.9 KiB
C++
125 lines
2.9 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) 2005 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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*
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* Lethal Weapon (VRC4 mapper)
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*/
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#include "mapinc.h"
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static uint8 prg0, prg1, mirr, swap;
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static uint8 chr[8];
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static uint8 IRQCount;
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static uint8 IRQPre;
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static uint8 IRQa;
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static SFORMAT StateRegs[]=
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{
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{&prg0, 1, "PRG0"},
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{&prg0, 1, "PRG1"},
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{&mirr, 1, "MIRR"},
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{&swap, 1, "SWAP"},
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{chr, 8, "CHR"},
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{&IRQCount, 1, "IRQCOUNT"},
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{&IRQPre, 1, "IRQPRE"},
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{&IRQa, 1, "IRQA"},
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{0}
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};
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static void SyncPrg(void)
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{
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if(swap&3)
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{
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setprg8(0x8000,~1);
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setprg8(0xC000,prg0);
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}
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else
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{
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setprg8(0x8000,prg0);
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setprg8(0xC000,~1);
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}
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setprg8(0xA000,prg1);
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setprg8(0xE000,~0);
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}
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static void SyncChr(void)
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{
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int i;
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for(i=0; i<8; i++)
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setchr1(i<<10,chr[i]);
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setmirror(mirr^1);
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}
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static void StateRestore(int version)
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{
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SyncPrg();
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SyncChr();
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}
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static DECLFW(UNLTF1201Write)
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{
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A=(A&0xF003)|((A&0xC)>>2);
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if((A>=0xB000)&&(A<=0xE003))
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{
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int ind=(((A>>11)-6)|(A&1))&7;
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int sar=((A&2)<<1);
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chr[ind]=(chr[ind]&(0xF0>>sar))|((V&0x0F)<<sar);
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SyncChr();
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}
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else switch (A&0xF003)
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{
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case 0x8000: prg0=V; SyncPrg(); break;
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case 0xA000: prg1=V; SyncPrg(); break;
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case 0x9000: mirr=V&1; SyncChr(); break;
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case 0x9001: swap=V&3; SyncPrg(); break;
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case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break;
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case 0xF002: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break;
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case 0xF001:
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case 0xF003: IRQa=V&2; X6502_IRQEnd(FCEU_IQEXT); if(scanline<240) IRQCount-=8; break;
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}
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}
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static void UNLTF1201IRQCounter(void)
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{
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if(IRQa)
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{
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IRQCount++;
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if(IRQCount==237)
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{
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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 UNLTF1201Power(void)
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{
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IRQPre=IRQCount=IRQa=0;
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x8000,0xFFFF,UNLTF1201Write);
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SyncPrg();
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SyncChr();
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}
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void UNLTF1201_Init(CartInfo *info)
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{
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info->Power=UNLTF1201Power;
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GameHBIRQHook=UNLTF1201IRQCounter;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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