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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 |
19 | * |
20 | * FDS Conversion |
21 | * |
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22 | */ |
23 | |
24 | #include "mapinc.h" |
25 | |
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26 | |
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27 | static void FP_FASTAPASS(1) Mapper50IRQ(int a) |
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28 | { |
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29 | if(IRQa) |
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30 | { |
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31 | if(IRQCount<4096) |
32 | IRQCount+=a; |
33 | else |
34 | { |
35 | IRQa=0; |
36 | X6502_IRQBegin(FCEU_IQEXT); |
37 | } |
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38 | } |
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39 | } |
40 | |
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41 | static void M50Restore(int version) |
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42 | { |
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43 | setprg8(0xc000,mapbyte1[0]); |
44 | } |
45 | |
46 | static DECLFW(M50W) |
47 | { |
48 | if((A&0xD060)==0x4020) |
49 | { |
50 | if(A&0x100) |
51 | { |
52 | IRQa=V&1; |
53 | if(!IRQa) IRQCount=0; |
54 | X6502_IRQEnd(FCEU_IQEXT); |
55 | } |
56 | else |
57 | { |
58 | V=((V&1)<<2)|((V&2)>>1)|((V&4)>>1)|(V&8); |
59 | mapbyte1[0]=V; |
60 | setprg8(0xc000,V); |
61 | } |
62 | } |
63 | } |
64 | |
65 | void Mapper50_init(void) |
66 | { |
67 | SetWriteHandler(0x4020,0x5fff,M50W); |
68 | SetReadHandler(0x6000,0xffff,CartBR); |
69 | MapStateRestore=M50Restore; |
70 | MapIRQHook=Mapper50IRQ; |
71 | |
72 | setprg8(0x6000,0xF); |
73 | setprg8(0x8000,0x8); |
74 | setprg8(0xa000,0x9); |
75 | setprg8(0xc000,0x0); |
76 | setprg8(0xe000,0xB); |
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77 | } |
78 | |