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 | |
24 | |
25 | DECLFW(Mapper73_write) |
26 | { |
27 | switch(A&0xF000) |
28 | { |
29 | case 0x8000:IRQCount&=0xFFF0;IRQCount|=(V&0xF);break; |
30 | case 0x9000:IRQCount&=0xFF0F;IRQCount|=(V&0xF)<<4;break; |
31 | case 0xa000:IRQCount&=0xF0FF;IRQCount|=(V&0xF)<<8;break; |
32 | case 0xb000:IRQCount&=0x0FFF;IRQCount|=(V&0xF)<<12;break; |
33 | case 0xc000:IRQa=V&2;break; |
34 | case 0xf000:ROM_BANK16(0x8000,V);break; |
35 | } |
36 | } |
37 | |
38 | static void FP_FASTAPASS(1) Mapper73IRQHook(int a) |
39 | { |
40 | if(IRQa) |
41 | { |
42 | IRQCount+=a; |
43 | if(IRQCount>=0xFFFF) |
44 | { |
45 | IRQCount&=0xFFFF; |
46 | IRQa=0; |
47 | TriggerIRQ(); |
48 | } |
49 | } |
50 | } |
51 | |
52 | void Mapper73_init(void) |
53 | { |
54 | SetWriteHandler(0x8000,0xffff,Mapper73_write); |
55 | MapIRQHook=Mapper73IRQHook; |
56 | } |
57 | |