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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
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4 | * Copyright (C) 2002 Xodnizel |
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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 |
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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19 | */ |
20 | |
21 | #include "mapinc.h" |
22 | |
23 | |
24 | #define suntoggle mapbyte1[0] |
25 | |
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26 | static DECLFW(Mapper67_write) |
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27 | { |
28 | A&=0xF800; |
29 | if((A&0x800) && A<=0xb800) |
30 | { |
31 | VROM_BANK2((A-0x8800)>>1,V); |
32 | } |
33 | else switch(A) |
34 | { |
35 | case 0xc800: |
36 | case 0xc000:if(!suntoggle) |
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37 | { |
38 | IRQCount&=0xFF; |
39 | IRQCount|=V<<8; |
40 | } |
41 | else |
42 | { |
43 | IRQCount&=0xFF00; |
44 | IRQCount|=V; |
45 | } |
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46 | suntoggle^=1; |
47 | break; |
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48 | case 0xd800:suntoggle=0;IRQa=V&0x10;X6502_IRQEnd(FCEU_IQEXT);break; |
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49 | |
50 | case 0xe800:switch(V&3) |
51 | { |
52 | case 0:MIRROR_SET2(1);break; |
53 | case 1:MIRROR_SET2(0);break; |
54 | case 2:onemir(0);break; |
55 | case 3:onemir(1);break; |
56 | } |
57 | break; |
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58 | case 0xf800:ROM_BANK16(0x8000,V);break; |
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59 | } |
60 | } |
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61 | static void FP_FASTAPASS(1) SunIRQHook(int a) |
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62 | { |
63 | if(IRQa) |
64 | { |
65 | IRQCount-=a; |
66 | if(IRQCount<=0) |
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67 | { |
68 | X6502_IRQBegin(FCEU_IQEXT); |
69 | IRQa=0; |
70 | IRQCount=0xFFFF; |
71 | } |
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72 | } |
73 | } |
74 | void Mapper67_init(void) |
75 | { |
76 | SetWriteHandler(0x8000,0xffff,Mapper67_write); |
77 | MapIRQHook=SunIRQHook; |
78 | } |