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 | static void Fixerit(void) |
24 | { |
25 | switch(mapbyte2[0]&3) |
26 | { |
27 | case 0:vnapage[0]=vnapage[2]=VROM+(((mapbyte1[0]|128)&CHRmask1[0])<<10); |
28 | vnapage[1]=vnapage[3]=VROM+(((mapbyte1[1]|128)&CHRmask1[0])<<10); |
29 | break; |
30 | case 1:vnapage[0]=vnapage[1]=VROM+(((mapbyte1[0]|128)&CHRmask1[0])<<10); |
31 | vnapage[2]=vnapage[3]=VROM+(((mapbyte1[1]|128)&CHRmask1[0])<<10); |
32 | break; |
33 | case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=VROM+(((mapbyte1[0]|128)&CHRmask1[0])<<10); |
34 | break; |
35 | case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=VROM+(((mapbyte1[1]|128)&CHRmask1[0])<<10); |
36 | break; |
37 | } |
38 | } |
39 | |
40 | DECLFW(Mapper68_write) |
41 | { |
42 | A&=0xF000; |
43 | |
44 | if(A>=0x8000 && A<=0xB000) |
45 | { |
46 | VROM_BANK2((A-0x8000)>>1,V); |
47 | } |
48 | else switch(A) |
49 | { |
50 | case 0xc000:mapbyte1[0]=V; |
51 | if(VROM_size && mapbyte2[0]&0x10) |
52 | Fixerit(); |
53 | break; |
54 | |
55 | case 0xd000:mapbyte1[1]=V; |
56 | if(VROM_size && mapbyte2[0]&0x10) |
57 | Fixerit(); |
58 | break; |
59 | |
60 | case 0xe000: mapbyte2[0]=V; |
61 | if(!(V&0x10)) |
62 | { |
63 | switch(V&3) |
64 | { |
65 | case 0:MIRROR_SET2(1);break; |
66 | case 1:MIRROR_SET2(0);break; |
67 | case 2:onemir(0);break; |
68 | case 3:onemir(1);break; |
69 | } |
70 | } |
71 | else if(VROM_size) |
72 | { |
73 | Fixerit(); |
74 | PPUNTARAM=0; |
75 | } |
76 | break; |
77 | case 0xf000: ROM_BANK16(0x8000,V);break; |
78 | } |
79 | } |
80 | |
81 | static void Mapper68_StateRestore(int version) |
82 | { |
83 | if(!(mapbyte2[0]&0x10)) |
84 | { |
85 | switch(mapbyte2[0]&3) |
86 | { |
87 | case 0:MIRROR_SET(0);break; |
88 | case 1:MIRROR_SET(1);break; |
89 | case 2:onemir(0);break; |
90 | case 3:onemir(1);break; |
91 | } |
92 | } |
93 | else if(VROM_size) |
94 | { |
95 | Fixerit(); |
96 | PPUNTARAM=0; |
97 | } |
98 | } |
99 | |
100 | void Mapper68_init(void) |
101 | { |
102 | SetWriteHandler(0x8000,0xffff,Mapper68_write); |
103 | MapStateRestore=Mapper68_StateRestore; |
104 | } |