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1 | /* FCE Ultra - NES/Famicom Emulator |
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2 | * |
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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 DECLFW(Mapper91_write) |
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24 | { |
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25 | //if(A>=0x7001) |
26 | //printf("$%04x:$%02x, %d\n",A,V,scanline); |
27 | A&=0xF007; |
28 | |
29 | if(A>=0x6000 && A<=0x6003) VROM_BANK2((A&3)*2048,V); |
30 | else switch(A&0xF003) |
31 | { |
32 | case 0x7000: |
33 | case 0x7001:ROM_BANK8(0x8000+(A&1)*8192,V);break; |
34 | case 0x7002:IRQa=IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break; |
35 | case 0x7003:IRQa=1;X6502_IRQEnd(FCEU_IQEXT);break; |
36 | // default: printf("Iyee: $%04x:$%02x\n",A,V);break; |
37 | } |
38 | //if(A>=0x7000) |
39 | // printf("$%04x:$%02x, %d\n",A,V,scanline); |
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40 | } |
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41 | |
42 | static void Mapper91_hb(void) |
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43 | { |
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44 | if(IRQCount<8 && IRQa) |
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45 | { |
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46 | IRQCount++; |
47 | if(IRQCount>=8) |
48 | { |
49 | X6502_IRQBegin(FCEU_IQEXT); |
50 | } |
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51 | } |
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52 | } |
53 | |
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54 | void Mapper91_init(void) |
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55 | { |
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56 | SetWriteHandler(0x4020,0xFFFF,Mapper91_write); |
57 | GameHBIRQHook=Mapper91_hb; |
58 | } |
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59 | |