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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(Mapper42_write) |
28 | { |
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29 | // FCEU_printf("%04x:%04x\n",A,V); |
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30 | switch(A&0xe003) |
31 | { |
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32 | case 0x8000:VROM_BANK8(V);break; |
33 | case 0xe000:mapbyte1[0]=V;ROM_BANK8(0x6000,V&0xF);break; |
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34 | case 0xe001:MIRROR_SET((V>>3)&1);break; |
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35 | case 0xe002:IRQa=V&2;if(!IRQa) IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break; |
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36 | } |
37 | } |
38 | |
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39 | static void FP_FASTAPASS(1) Mapper42IRQ(int a) |
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40 | { |
41 | if(IRQa) |
42 | { |
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43 | IRQCount+=a; |
44 | if(IRQCount>=32768) IRQCount-=32768; |
45 | if(IRQCount>=24576) |
46 | X6502_IRQBegin(FCEU_IQEXT); |
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47 | else |
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48 | X6502_IRQEnd(FCEU_IQEXT); |
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49 | } |
50 | } |
51 | |
52 | static void Mapper42_StateRestore(int version) |
53 | { |
54 | ROM_BANK8(0x6000,mapbyte1[0]&0xF); |
55 | } |
56 | |
57 | |
58 | void Mapper42_init(void) |
59 | { |
60 | ROM_BANK8(0x6000,0); |
61 | ROM_BANK32(~0); |
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62 | SetWriteHandler(0x6000,0xffff,Mapper42_write); |
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63 | SetReadHandler(0x6000,0x7fff,CartBR); |
64 | MapStateRestore=Mapper42_StateRestore; |
65 | MapIRQHook=Mapper42IRQ; |
66 | } |
67 | |