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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 cmd mapbyte1[0] |
24 | #define mir mapbyte1[1] |
25 | #define rmode mapbyte1[2] |
26 | #define regsl mapbyte2 |
27 | #define regsh mapbyte3 |
28 | |
29 | static void RAMBO1_hb(void) |
30 | { |
31 | rmode=0; |
32 | if(IRQCount>=0) |
33 | { |
34 | IRQCount--; |
35 | if(IRQCount<0) |
36 | { |
37 | if(IRQa) |
38 | { |
39 | // printf("IRQ: %d\n",scanline); |
40 | rmode = 1; |
41 | X6502_IRQBegin(FCEU_IQEXT); |
42 | } |
43 | } |
44 | } |
45 | } |
46 | |
47 | static void Synco(void) |
48 | { |
49 | int x; |
50 | |
51 | if(cmd&0x20) |
52 | { |
53 | setchr1(0x0000,regsl[0]); |
54 | setchr1(0x0800,regsl[1]); |
55 | setchr1(0x0400,regsh[0]); |
56 | setchr1(0x0c00,regsh[1]); |
57 | } |
58 | else |
59 | { |
60 | setchr2(0x0000,regsl[0]>>1); |
61 | setchr2(0x0800,regsl[1]>>1); |
62 | } |
63 | |
64 | for(x=0;x<4;x++) |
65 | setchr1(0x1000+x*0x400,regsl[2+x]); |
66 | |
67 | setprg8(0x8000,regsl[6]); |
68 | setprg8(0xA000,regsl[7]); |
69 | |
70 | setprg8(0xC000,regsh[7]); |
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71 | X6502_Rebase(); |
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72 | } |
73 | |
74 | |
75 | static DECLFW(RAMBO1_write) |
76 | { |
77 | //if(A>=0xC000 && A<=0xFFFF) printf("$%04x:$%02x, %d, %d\n",A,V,scanline,timestamp); |
78 | switch(A&0xF001) |
79 | { |
80 | case 0xa000:mir=V&1; |
81 | setmirror(mir^1); |
82 | break; |
83 | case 0x8000:cmd = V; |
84 | break; |
85 | case 0x8001: |
86 | if((cmd&15)<8) |
87 | regsl[cmd&7]=V; |
88 | else |
89 | regsh[cmd&7]=V; |
90 | Synco(); |
91 | break; |
92 | case 0xc000:IRQLatch=V; |
93 | if(rmode==1) |
94 | { |
95 | IRQCount=IRQLatch; |
96 | } |
97 | break; |
98 | case 0xc001:rmode=1; |
99 | IRQCount=IRQLatch; |
100 | break; |
101 | case 0xE000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT); |
102 | if(rmode==1) |
103 | {IRQCount=IRQLatch;} |
104 | break; |
105 | case 0xE001:IRQa=1; |
106 | if(rmode==1) |
107 | {IRQCount=IRQLatch;} |
108 | break; |
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109 | } |
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110 | } |
111 | |
112 | static void RAMBO1_Restore(int version) |
113 | { |
114 | if(version<74) |
115 | { |
116 | int x; |
117 | |
118 | x=mapbyte1[1]; // was MMC3_cmd |
119 | cmd=x; |
120 | |
121 | regsl[0]=CHRBankList[0]; |
122 | regsl[1]=CHRBankList[2]; |
123 | regsh[0]=CHRBankList[1]; |
124 | regsh[1]=CHRBankList[3]; |
125 | |
126 | for(x=0;x<4;x++) |
127 | regsl[2+x]=CHRBankList[4+x]; |
128 | |
129 | regsl[6]=PRGBankList[0]; |
130 | regsl[7]=PRGBankList[1]; |
131 | regsh[7]=PRGBankList[2]; |
132 | mir=Mirroring^1; |
133 | } |
134 | Synco(); |
135 | setmirror(mir^1); |
136 | } |
137 | |
138 | void Mapper64_init(void) |
139 | { |
140 | int x; |
141 | |
142 | for(x=0;x<8;x++) |
143 | regsl[x]=regsh[x]=~0; |
144 | cmd=0; |
145 | mir=0; |
146 | setmirror(1); |
147 | Synco(); |
148 | GameHBIRQHook=RAMBO1_hb; |
149 | GameStateRestore=RAMBO1_Restore; |
150 | SetWriteHandler(0x8000,0xffff,RAMBO1_write); |
151 | } |