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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 | static void FP_FASTAPASS(1) FFEIRQHook(int a) |
26 | { |
27 | if(IRQa) |
28 | { |
29 | IRQCount+=a; |
30 | |
31 | if(IRQCount>=0x10000) |
32 | { |
33 | TriggerIRQ(); |
34 | IRQa=0; |
35 | IRQCount=0; |
36 | } |
37 | } |
38 | } |
39 | |
40 | |
41 | DECLFW(Mapper17_write) |
42 | { |
43 | switch(A){ |
44 | default: |
45 | break; |
46 | case 0x42FE: |
47 | onemir((V>>4)&1); |
48 | break; |
49 | case 0x42FF: |
50 | MIRROR_SET((V>>4)&1); |
51 | break; |
52 | case 0x4501:IRQa=V&1;break; |
53 | case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break; |
54 | case 0x4503:IRQCount&=0x00FF;IRQCount|=V<<8;IRQa=1;break; |
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55 | case 0x4504: ROM_BANK8(0x8000,V); |
56 | X6502_Rebase();break; |
57 | case 0x4505: ROM_BANK8(0xA000,V); |
58 | X6502_Rebase();break; |
59 | case 0x4506: ROM_BANK8(0xC000,V); |
60 | X6502_Rebase();break; |
61 | case 0x4507: ROM_BANK8(0xE000,V); |
62 | X6502_Rebase();break; |
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63 | case 0x4510: VROM_BANK1(0x0000,V);break; |
64 | case 0x4511: VROM_BANK1(0x0400,V);break; |
65 | case 0x4512: VROM_BANK1(0x0800,V);break; |
66 | case 0x4513: VROM_BANK1(0x0C00,V);break; |
67 | case 0x4514: VROM_BANK1(0x1000,V);break; |
68 | case 0x4515: VROM_BANK1(0x1400,V);break; |
69 | case 0x4516: VROM_BANK1(0x1800,V);break; |
70 | case 0x4517: VROM_BANK1(0x1C00,V);break; |
71 | } |
72 | } |
73 | |
74 | void Mapper17_init(void) |
75 | { |
76 | MapIRQHook=FFEIRQHook; |
77 | SetWriteHandler(0x4020,0x5fff,Mapper17_write); |
78 | } |