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
23 #define K4buf mapbyte2
24 #define K4IRQ mapbyte1[1]
25 #define K4sel mapbyte1[0]
28 static DECLFW(Mapper25_write)
30 A=(A&0xF003)|((A&0xC)>>2);
32 if((A&0xF000)==0xA000)
34 else if(A>=0xB000 && A<=0xEFFF)
36 int x=(A&1)|((A-0xB000)>>11);
38 K4buf[x]&=(0xF0)>>((A&2)<<1);
39 K4buf[x]|=(V&0xF)<<((A&2)<<1);
40 VROM_BANK1(x<<10,K4buf[x]);
42 else if((A&0xF000)==0x8000)
51 case 0x9000:switch(V&0x3)
53 case 0:MIRROR_SET(0);break;
54 case 1:MIRROR_SET(1);break;
55 case 2:onemir(0);break;
56 case 3:onemir(1);break;
59 case 0x9001:if((K4sel&2)!=(V&2))
63 ROM_BANK8(0x8000,PRGBankList[2]);
64 ROM_BANK8(0xc000,swa);
68 case 0xf000:IRQLatch&=0xF0;IRQLatch|=V&0xF;break;
69 case 0xf002:IRQLatch&=0x0F;IRQLatch|=V<<4;break;
70 case 0xf001:IRQCount=IRQLatch;IRQa=V&2;K4IRQ=V&1;acount=0;X6502_IRQEnd(FCEU_IQEXT);break;
71 case 0xf003:IRQa=K4IRQ;X6502_IRQEnd(FCEU_IQEXT);break;
75 static void FP_FASTAPASS(1) KonamiIRQHook(int a)
77 // #define LCYCS ((227*2))
85 doagainbub:acount-=LCYCS;IRQCount++;
88 X6502_IRQBegin(FCEU_IQEXT);IRQCount=IRQLatch;
90 if(acount>=LCYCS) goto doagainbub;
95 void Mapper25_init(void)
97 SetWriteHandler(0x8000,0xffff,Mapper25_write);
98 MapIRQHook=KonamiIRQHook;