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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Ben Parnell |
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] |
26 | |
27 | DECLFW(Mapper25_write) |
28 | { |
29 | A=(A&0xF003)|((A&0xC)>>2); |
30 | |
31 | if((A&0xF000)==0xA000) |
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32 | { |
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33 | ROM_BANK8(0xA000,V); |
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34 | X6502_Rebase(); |
35 | } |
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36 | else if(A>=0xB000 && A<=0xEFFF) |
37 | { |
38 | int x=(A&1)|((A-0xB000)>>11); |
39 | |
40 | K4buf[x]&=(0xF0)>>((A&2)<<1); |
41 | K4buf[x]|=(V&0xF)<<((A&2)<<1); |
42 | VROM_BANK1(x<<10,K4buf[x]); |
43 | } |
44 | else if((A&0xF000)==0x8000) |
45 | { |
46 | if(K4sel&2) |
47 | ROM_BANK8(0xC000,V); |
48 | else |
49 | ROM_BANK8(0x8000,V); |
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50 | X6502_Rebase(); |
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51 | } |
52 | else switch(A) |
53 | { |
54 | case 0x9000:switch(V&0x3) |
55 | { |
56 | case 0:MIRROR_SET(0);break; |
57 | case 1:MIRROR_SET(1);break; |
58 | case 2:onemir(0);break; |
59 | case 3:onemir(1);break; |
60 | } |
61 | break; |
62 | case 0x9001:if((K4sel&2)!=(V&2)) |
63 | { |
64 | uint8 swa; |
65 | swa=PRGBankList[0]; |
66 | ROM_BANK8(0x8000,PRGBankList[2]); |
67 | ROM_BANK8(0xc000,swa); |
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68 | X6502_Rebase(); |
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69 | } |
70 | K4sel=V; |
71 | break; |
72 | case 0xf000:IRQLatch&=0xF0;IRQLatch|=V&0xF;break; |
73 | case 0xf002:IRQLatch&=0x0F;IRQLatch|=V<<4;break; |
74 | case 0xf001:IRQCount=IRQLatch;IRQa=V&2;K4IRQ=V&1;break; |
75 | case 0xf003:IRQa=K4IRQ;break; |
76 | } |
77 | } |
78 | |
79 | static void FP_FASTAPASS(1) KonamiIRQHook(int a) |
80 | { |
81 | static int count=0; |
82 | #define LCYCS 114 |
83 | if(IRQa) |
84 | { |
85 | count+=a; |
86 | if(count>=LCYCS) |
87 | { |
88 | doagainbub:count-=LCYCS;IRQCount++; |
89 | if(IRQCount&0x100) {count=0;TriggerIRQ();IRQCount=IRQLatch;} |
90 | if(count>=LCYCS) goto doagainbub; |
91 | } |
92 | } |
93 | } |
94 | |
95 | void Mapper25_init(void) |
96 | { |
97 | SetWriteHandler(0x8000,0xffff,Mapper25_write); |
98 | MapIRQHook=KonamiIRQHook; |
99 | } |
100 | |