e2d0dd92 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2005 CaH4e3 |
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 | |
22 | #include "mapinc.h" |
23 | |
24 | static uint8 prg_reg; |
25 | static uint8 chr_reg; |
26 | static uint8 hrd_flag; |
27 | |
28 | static SFORMAT StateRegs[]= |
29 | { |
30 | {&prg_reg, 1, "PRG"}, |
31 | {&chr_reg, 1, "CHR"}, |
32 | {0} |
33 | }; |
34 | |
35 | static void Sync(void) |
36 | { |
37 | if(prg_reg&0x80) |
38 | setprg32(0x8000,prg_reg>>6); |
39 | else |
40 | { |
41 | setprg16(0x8000,(prg_reg>>5)&3); |
42 | setprg16(0xC000,(prg_reg>>5)&3); |
43 | } |
44 | setmirror((prg_reg&8)>>3); |
45 | setchr8((chr_reg&3)|(prg_reg&7)|((prg_reg&0x10)>>1)); |
46 | } |
47 | |
48 | static DECLFR(M57Read) |
49 | { |
50 | return hrd_flag; |
51 | } |
52 | |
53 | static DECLFW(M57Write) |
54 | { |
55 | if((A&0x8800)==0x8800) |
56 | prg_reg=V; |
57 | else |
58 | chr_reg=V; |
59 | Sync(); |
60 | } |
61 | |
62 | static void M57Power(void) |
63 | { |
64 | prg_reg=0; |
65 | chr_reg=0; |
66 | hrd_flag=0; |
67 | SetReadHandler(0x8000,0xFFFF,CartBR); |
68 | SetWriteHandler(0x8000,0xFFFF,M57Write); |
69 | SetReadHandler(0x6000,0x6000,M57Read); |
70 | Sync(); |
71 | } |
72 | |
73 | static void M57Reset() |
74 | { |
75 | if(hrd_flag==3) |
76 | hrd_flag=0; |
77 | else |
78 | hrd_flag++; |
79 | FCEU_printf("Select Register = %02x\n",hrd_flag); |
80 | } |
81 | |
82 | static void StateRestore(int version) |
83 | { |
84 | Sync(); |
85 | } |
86 | |
87 | void Mapper57_Init(CartInfo *info) |
88 | { |
89 | info->Power=M57Power; |
90 | info->Reset=M57Reset; |
91 | GameStateRestore=StateRestore; |
92 | AddExState(&StateRegs, ~0, 0, 0); |
93 | } |