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 K4buf mapbyte2
24 #define K4IRQ mapbyte1[1]
25 #define K4sel mapbyte1[0]
27 DECLFW(Mapper23_write)
29 if((A&0xF000)==0x8000)
36 else if((A&0xF000)==0xA000)
40 A|=((A>>2)&0x3)|((A>>4)&0x3)|((A>>6)&0x3);
42 if(A>=0xb000 && A<=0xe003)
44 int x=((A>>1)&1)|((A-0xB000)>>11);
46 K4buf[x]&=(0xF0)>>((A&1)<<2);
47 K4buf[x]|=(V&0xF)<<((A&1)<<2);
48 VROM_BANK1(x<<10,K4buf[x]);
53 case 0xf000:X6502_IRQEnd(FCEU_IQEXT);IRQLatch&=0xF0;IRQLatch|=V&0xF;break;
54 case 0xf001:X6502_IRQEnd(FCEU_IQEXT);IRQLatch&=0x0F;IRQLatch|=V<<4;break;
55 case 0xf002:X6502_IRQEnd(FCEU_IQEXT);IRQCount=IRQLatch;IRQa=V&2;K4IRQ=V&1;break;
56 case 0xf003:X6502_IRQEnd(FCEU_IQEXT);IRQa=K4IRQ;break;
64 ROM_BANK8(0x8000,PRGBankList[2]);
65 ROM_BANK8(0xc000,swa);
72 case 0:MIRROR_SET(0);break;
73 case 1:MIRROR_SET(1);break;
74 case 2:onemir(0);break;
75 case 3:onemir(1);break;
82 void FP_FASTAPASS(1) KonamiIRQHook2(int a)
90 doagainbub:acount-=342;IRQCount++;
91 if(IRQCount&0x100) {X6502_IRQBegin(FCEU_IQEXT);IRQCount=IRQLatch;}
92 if(acount>=342) goto doagainbub;
97 void Mapper23_init(void)
99 SetWriteHandler(0x8000,0xffff,Mapper23_write);
100 MapIRQHook=KonamiIRQHook2;