c62d2810 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Ben Parnell |
5 | * |
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. |
10 | * |
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. |
15 | * |
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 |
19 | */ |
20 | |
21 | #include "mapinc.h" |
22 | |
23 | static DECLFW(Mapper33_write) |
24 | { |
25 | A&=0xF003; |
26 | |
27 | //printf("$%04x:$%02x, %d\n",A,V,scanline); |
28 | if(A>=0xA000 && A<=0xA003) |
29 | VROM_BANK1(0x1000+((A&3)<<10),V); |
30 | else switch(A){ |
31 | case 0x8000:if(!mapbyte1[0]) |
32 | MIRROR_SET((V>>6)&1); |
33 | ROM_BANK8(0x8000,V); |
34 | break; |
35 | case 0x8001:ROM_BANK8(0xA000,V); break; |
36 | case 0x8002:VROM_BANK2(0x0000,V);break; |
37 | case 0x8003:VROM_BANK2(0x0800,V);break; |
38 | case 0xc000:IRQLatch=V;break; |
39 | case 0xc001:IRQCount=IRQLatch;break; |
40 | case 0xc003:IRQa=0;break; |
41 | case 0xc002:IRQa=1;break; |
42 | case 0xe000:mapbyte1[0]=1;MIRROR_SET((V>>6)&1);break; |
43 | } |
44 | } |
45 | |
46 | static void heho(void) |
47 | { |
48 | if(IRQa) |
49 | { |
50 | IRQCount++; |
51 | if(IRQCount==0x100) |
52 | { |
53 | TriggerIRQ(); |
54 | IRQa=0; |
55 | } |
56 | } |
57 | } |
58 | |
59 | void Mapper33_init(void) |
60 | { |
61 | SetWriteHandler(0x8000,0xffff,Mapper33_write); |
62 | GameHBIRQHook=heho; |
63 | } |