1 /* FCE Ultra - NES/Famicom Emulator
3 * Copyright notice for this file:
4 * Copyright (C) 2002 Ben Parnell
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
23 #define cmd mapbyte1[0]
24 #define lpa mapbyte1[1]
27 static void PRGSynco(void)
31 ROM_BANK16(0x8000,lpa&0xF);
35 ROM_BANK8(0x8000,prgl[0]&0x1F);
36 ROM_BANK8(0xa000,prgl[1]&0x1F);
40 static DECLFW(Mapper248_writelow)
46 static DECLFW(Mapper248_write)
50 case 0xa000:MIRROR_SET(V&1);break; // Not sure if this is right. Mirroring may be hard wired...
51 case 0xc000:IRQLatch=V;break;
52 case 0xc001:IRQCount=IRQLatch;break;
53 case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
54 case 0xe001:IRQa=1;break;
55 case 0x8000:cmd=V;break;
56 case 0x8001:switch(cmd&7)
58 case 0:VROM_BANK2(0x000,V>>1);break;
59 case 1:VROM_BANK2(0x800,V>>1);break;
60 case 2:VROM_BANK1(0x1000,V);break;
61 case 3:VROM_BANK1(0x1400,V);break;
62 case 4:VROM_BANK1(0x1800,V);break;
63 case 5:VROM_BANK1(0x1c00,V);break;
64 case 6:prgl[0]=V;PRGSynco();break;
65 case 7:prgl[1]=V;PRGSynco();break;
71 static void Mapper248_hb(void)
78 X6502_IRQBegin(FCEU_IQEXT);
84 void Mapper248_init(void)
86 SetWriteHandler(0x6000,0x6fff,Mapper248_writelow);
87 SetWriteHandler(0x8000,0xffff,Mapper248_write);
88 GameHBIRQHook=Mapper248_hb;