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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 | |
23 | #define K4buf mapbyte2 |
24 | #define K4IRQ mapbyte1[1] |
25 | #define K4sel mapbyte1[0] |
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26 | static int acount=0; |
27 | static DECLFW(Mapper23_write) |
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28 | { |
29 | if((A&0xF000)==0x8000) |
30 | { |
31 | if(K4sel&2) |
32 | ROM_BANK8(0xC000,V); |
33 | else |
34 | ROM_BANK8(0x8000,V); |
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35 | } |
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36 | else if((A&0xF000)==0xA000) |
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37 | ROM_BANK8(0xA000,V); |
38 | else |
39 | { |
40 | A|=((A>>2)&0x3)|((A>>4)&0x3)|((A>>6)&0x3); |
41 | A&=0xF003; |
42 | if(A>=0xb000 && A<=0xe003) |
43 | { |
44 | int x=((A>>1)&1)|((A-0xB000)>>11); |
45 | |
46 | K4buf[x]&=(0xF0)>>((A&1)<<2); |
47 | K4buf[x]|=(V&0xF)<<((A&1)<<2); |
48 | VROM_BANK1(x<<10,K4buf[x]); |
49 | } |
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50 | else |
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51 | switch(A) |
52 | { |
53 | case 0xf000:X6502_IRQEnd(FCEU_IQEXT);IRQLatch&=0xF0;IRQLatch|=V&0xF;break; |
54 | case 0xf001:X6502_IRQEnd(FCEU_IQEXT);IRQLatch&=0x0F;IRQLatch|=V<<4;break; |
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55 | case 0xf002:X6502_IRQEnd(FCEU_IQEXT);acount=0;IRQCount=IRQLatch;IRQa=V&2;K4IRQ=V&1;break; |
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56 | case 0xf003:X6502_IRQEnd(FCEU_IQEXT);IRQa=K4IRQ;break; |
57 | case 0x9001: |
58 | case 0x9002: |
59 | case 0x9003: |
60 | if((K4sel&2)!=(V&2)) |
61 | { |
62 | uint8 swa; |
63 | swa=PRGBankList[0]; |
64 | ROM_BANK8(0x8000,PRGBankList[2]); |
65 | ROM_BANK8(0xc000,swa); |
66 | } |
67 | K4sel=V; |
68 | break; |
69 | case 0x9000: |
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70 | if(V!=0xFF) |
71 | switch(V&0x3) |
72 | { |
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73 | case 0:MIRROR_SET(0);break; |
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74 | case 1:MIRROR_SET(1);break; |
75 | case 2:onemir(0);break; |
76 | case 3:onemir(1);break; |
77 | } |
78 | break; |
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79 | } |
80 | } |
81 | } |
82 | |
83 | void FP_FASTAPASS(1) KonamiIRQHook2(int a) |
84 | { |
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85 | #define LCYCS 341 |
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86 | if(IRQa) |
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87 | { |
88 | acount+=a*3; |
89 | if(acount>=LCYCS) |
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90 | { |
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91 | doagainbub:acount-=LCYCS;IRQCount++; |
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92 | if(IRQCount&0x100) {X6502_IRQBegin(FCEU_IQEXT);IRQCount=IRQLatch;} |
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93 | if(acount>=LCYCS) goto doagainbub; |
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94 | } |
95 | } |
96 | } |
97 | |
98 | void Mapper23_init(void) |
99 | { |
100 | SetWriteHandler(0x8000,0xffff,Mapper23_write); |
101 | MapIRQHook=KonamiIRQHook2; |
102 | } |
103 | |