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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 | |
26 | |
27 | static DECLFW(Mapper40_write) |
28 | { |
29 | switch(A&0xe000) |
30 | { |
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31 | case 0x8000:IRQa=0;IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break; |
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32 | case 0xa000:IRQa=1;break; |
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33 | case 0xe000:ROM_BANK8(0xc000,V&7);break; |
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34 | } |
35 | } |
36 | |
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37 | static void FP_FASTAPASS(1) Mapper40IRQ(int a) |
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38 | { |
39 | if(IRQa) |
40 | { |
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41 | if(IRQCount<4096) |
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42 | IRQCount+=a; |
43 | else |
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44 | { |
45 | IRQa=0; |
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46 | X6502_IRQBegin(FCEU_IQEXT); |
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47 | } |
48 | } |
49 | } |
50 | |
51 | void Mapper40_init(void) |
52 | { |
53 | ROM_BANK8(0x6000,(~0)-1); |
54 | ROM_BANK8(0x8000,(~0)-3); |
55 | ROM_BANK8(0xa000,(~0)-2); |
56 | SetWriteHandler(0x8000,0xffff,Mapper40_write); |
57 | SetReadHandler(0x6000,0x7fff,CartBR); |
58 | MapIRQHook=Mapper40IRQ; |
59 | } |
60 | |
61 | |