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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 |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | */ |
20 | |
21 | #include "mapinc.h" |
22 | |
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23 | static int is48; |
24 | |
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25 | static DECLFW(Mapper33_write) |
26 | { |
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27 | //printf("%04x:%02x, %d\n",A,V,scanline); |
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28 | |
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29 | A&=0xF003; |
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30 | if(A>=0xA000 && A<=0xA003) |
31 | VROM_BANK1(0x1000+((A&3)<<10),V); |
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32 | else switch(A) |
33 | { |
34 | case 0x8000:if(!is48) MIRROR_SET((V>>6)&1); |
35 | ROM_BANK8(0x8000,V); |
36 | break; |
37 | case 0x8001:ROM_BANK8(0xA000,V); break; |
38 | case 0x8002:VROM_BANK2(0x0000,V);break; |
39 | case 0x8003:VROM_BANK2(0x0800,V);break; |
40 | } |
41 | } |
42 | |
43 | static DECLFW(Mapper48_HiWrite) |
44 | { |
45 | switch(A&0xF003) |
46 | { |
47 | case 0xc000:IRQLatch=V;break; |
48 | case 0xc001:IRQCount=IRQLatch;break; |
49 | case 0xc003:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break; |
50 | case 0xc002:IRQa=1;break; |
51 | case 0xe000:MIRROR_SET((V>>6)&1);break; |
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52 | } |
53 | } |
54 | |
55 | static void heho(void) |
56 | { |
57 | if(IRQa) |
58 | { |
59 | IRQCount++; |
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60 | if(IRQCount==0x100) |
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61 | { |
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62 | X6502_IRQBegin(FCEU_IQEXT); |
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63 | IRQa=0; |
64 | } |
65 | } |
66 | } |
67 | |
68 | void Mapper33_init(void) |
69 | { |
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70 | SetWriteHandler(0x8000,0xffff,Mapper33_write); |
71 | is48=0; |
72 | } |
73 | |
74 | void Mapper48_init(void) |
75 | { |
76 | SetWriteHandler(0x8000,0xffff,Mapper33_write); |
77 | SetWriteHandler(0xc000,0xffff,Mapper48_HiWrite); |
78 | GameHBIRQHook=heho; |
79 | is48=1; |
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80 | } |