c62d2810 |
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 MMC4reg mapbyte1 |
24 | #define latcha1 mapbyte2[0] |
25 | #define latcha2 mapbyte2[1] |
26 | |
27 | |
28 | static void FP_FASTAPASS(1) latchcheck(uint32 VAddr) |
29 | { |
30 | uint8 l,h; |
31 | |
32 | h=VAddr>>8; |
33 | |
34 | if(h>=0x20 || ((h&0xF)!=0xF)) |
35 | return; |
36 | |
37 | l=VAddr&0xF0; |
38 | |
39 | if(h<0x10) |
40 | { |
41 | if(l==0xD0) |
42 | { |
43 | VROM_BANK4(0x0000,MMC4reg[0]); |
44 | latcha1=0xFD; |
45 | } |
46 | else if(l==0xE0) |
47 | { |
48 | VROM_BANK4(0x0000,MMC4reg[1]); |
49 | latcha1=0xFE; |
50 | } |
51 | } |
52 | else |
53 | { |
54 | if(l==0xD0) |
55 | { |
56 | VROM_BANK4(0x1000,MMC4reg[2]); |
57 | latcha2=0xFD; |
58 | } |
59 | else if(l==0xE0) |
60 | { |
61 | VROM_BANK4(0x1000,MMC4reg[3]); |
62 | latcha2=0xFE; |
63 | } |
64 | } |
65 | } |
66 | |
67 | DECLFW(Mapper9_write) // $Axxx |
68 | { |
69 | ROM_BANK8(0x8000,V); |
70 | } |
71 | |
72 | DECLFW(Mapper10_write) |
73 | { |
74 | ROM_BANK16(0x8000,V); |
75 | } |
76 | |
77 | DECLFW(Mapper9and10_write) |
78 | { |
79 | switch(A&0xF000) |
80 | { |
81 | case 0xB000: |
82 | if (latcha1==0xFD) { VROM_BANK4(0x0000,V);} |
83 | MMC4reg[0]=V; |
84 | break; |
85 | case 0xC000: |
86 | if (latcha1==0xFE) {VROM_BANK4(0x0000,V);} |
87 | MMC4reg[1]=V; |
88 | break; |
89 | case 0xD000: |
90 | if (latcha2==0xFD) {VROM_BANK4(0x1000,V);} |
91 | MMC4reg[2]=V; |
92 | break; |
93 | case 0xE000: |
94 | if (latcha2==0xFE) {VROM_BANK4(0x1000,V);} |
95 | MMC4reg[3]=V; |
96 | break; |
97 | case 0xF000: |
98 | MIRROR_SET(V&1); |
99 | break; |
100 | } |
101 | } |
102 | |
103 | void Mapper9_init(void) |
104 | { |
105 | latcha1=0xFE; |
106 | latcha2=0xFE; |
107 | ROM_BANK8(0xA000,~2); |
108 | ROM_BANK8(0x8000,0); |
109 | SetWriteHandler(0xA000,0xAFFF,Mapper9_write); |
110 | SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write); |
111 | PPU_hook=latchcheck; |
112 | } |
113 | |
114 | void Mapper10_init(void) |
115 | { |
116 | latcha1=latcha2=0xFE; |
117 | SetWriteHandler(0xA000,0xAFFF,Mapper10_write); |
118 | SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write); |
119 | PPU_hook=latchcheck; |
120 | } |
121 | |