1 /* FCE Ultra - NES/Famicom Emulator
3 * Copyright notice for this file:
4 * Copyright (C) 2002 Xodnizel
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 static DECLFW(Mapper42_write)
29 // FCEU_printf("%04x:%04x\n",A,V);
32 case 0x8000:VROM_BANK8(V);break;
33 case 0xe000:mapbyte1[0]=V;ROM_BANK8(0x6000,V&0xF);break;
34 case 0xe001:MIRROR_SET((V>>3)&1);break;
35 case 0xe002:IRQa=V&2;if(!IRQa) IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break;
39 static void FP_FASTAPASS(1) Mapper42IRQ(int a)
44 if(IRQCount>=32768) IRQCount-=32768;
46 X6502_IRQBegin(FCEU_IQEXT);
48 X6502_IRQEnd(FCEU_IQEXT);
52 static void Mapper42_StateRestore(int version)
54 ROM_BANK8(0x6000,mapbyte1[0]&0xF);
58 void Mapper42_init(void)
62 SetWriteHandler(0x6000,0xffff,Mapper42_write);
63 SetReadHandler(0x6000,0x7fff,CartBR);
64 MapStateRestore=Mapper42_StateRestore;
65 MapIRQHook=Mapper42IRQ;