c62d2810 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 1998 BERO |
5 | * Copyright (C) 2002 Ben Parnell |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | */ |
21 | |
22 | #include "mapinc.h" |
23 | |
24 | #define MMC1_reg mapbyte1 |
25 | #define MMC1_buf mapbyte2[0] |
26 | #define MMC1_sft mapbyte3[0] |
27 | #define lastn mapbyte2[1] |
28 | |
29 | #define NWCDIP 0xE |
30 | |
31 | static void FP_FASTAPASS(1) NWCIRQHook(int a) |
32 | { |
33 | if(!(MMC1_reg[1]&0x10)) |
34 | { |
35 | IRQCount+=a; |
36 | if((IRQCount|(NWCDIP<<25))>=0x3e000000) |
37 | { |
38 | IRQCount=0; |
39 | X6502_IRQBegin(FCEU_IQEXT); |
40 | } |
41 | } |
42 | } |
43 | |
44 | |
45 | static void MMC1PRG(void) |
46 | { |
47 | if(MMC1_reg[1]&8) |
48 | { |
49 | switch(MMC1_reg[0]&0xC) |
50 | { |
51 | case 0xC: ROM_BANK16(0x8000,8+(MMC1_reg[3]&7)); |
52 | ROM_BANK16(0xC000,15); |
53 | break; |
54 | case 0x8: ROM_BANK16(0xC000,8+((MMC1_reg[3])&7)); |
55 | ROM_BANK16(0x8000,8); |
56 | break; |
57 | case 0x0: |
58 | case 0x4: |
59 | ROM_BANK16(0x8000,8+(MMC1_reg[3]&6)); |
60 | ROM_BANK16(0xc000,8+((MMC1_reg[3]&6)+1)); |
61 | break; |
62 | } |
63 | } |
64 | else |
65 | { |
66 | ROM_BANK32((MMC1_reg[1]>>1)&3); |
67 | } |
68 | } |
69 | |
70 | DECLFW(Mapper105_write) |
71 | { |
72 | int n=(A>>13)-4; |
73 | |
74 | if (V&0x80) |
75 | { |
76 | MMC1_sft=MMC1_buf=0; |
77 | return; |
78 | } |
79 | |
80 | if(lastn!=n) |
81 | { |
82 | MMC1_sft=MMC1_buf=0; |
83 | } |
84 | lastn=n; |
85 | |
86 | //MMC1_reg[n]&=~((1)<<(MMC1_sft)); |
87 | MMC1_buf|=(V&1)<<(MMC1_sft++); |
88 | |
89 | if (MMC1_sft==5) |
90 | { |
91 | if(n==3) V&=0xF; |
92 | else V&=0x1F; |
93 | |
94 | MMC1_reg[n]=V=MMC1_buf; |
95 | MMC1_sft = MMC1_buf=0; |
96 | |
97 | switch(n){ |
98 | case 0: |
99 | switch(MMC1_reg[0]&3) |
100 | { |
101 | case 2: MIRROR_SET(0);break; |
102 | case 3: MIRROR_SET(1);break; |
103 | case 0: onemir(0);break; |
104 | case 1: onemir(1);break; |
105 | } |
106 | MMC1PRG(); |
107 | break; |
108 | case 1: |
109 | if(MMC1_reg[1]&0x10) |
110 | {IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);} |
111 | MMC1PRG(); |
112 | break; |
113 | case 3: |
114 | MMC1PRG(); |
115 | break; |
116 | } |
117 | } |
118 | } |
119 | |
120 | |
121 | void Mapper105_init(void) |
122 | { |
123 | int i; |
124 | for(i=0;i<4;i++) MMC1_reg[i]=0; |
125 | MMC1_sft = MMC1_buf =0; |
126 | MMC1_reg[0]=0xC; |
127 | ROM_BANK32(0); |
128 | SetWriteHandler(0x8000,0xFFFF,Mapper105_write); |
129 | MapIRQHook=NWCIRQHook; |
130 | } |
131 | |