| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2002 Xodnizel |
| 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 uint8 lastA; |
| 24 | static uint8 DRegs[8]; |
| 25 | static uint8 cmd; |
| 26 | static uint8 MirCache[8]; |
| 27 | |
| 28 | static SFORMAT DB_StateRegs[]={ |
| 29 | {DRegs, 8, "DREG"}, |
| 30 | {&cmd, 1, "CMD"}, |
| 31 | {&lastA, 1, "LAST"}, |
| 32 | {0} |
| 33 | }; |
| 34 | |
| 35 | static void FP_FASTAPASS(1) dragonbust_ppu(uint32 A) |
| 36 | { |
| 37 | static int last=-1; |
| 38 | static uint8 z; |
| 39 | |
| 40 | if(A>=0x2000) return; |
| 41 | |
| 42 | A>>=10; |
| 43 | |
| 44 | lastA=A; |
| 45 | |
| 46 | z=MirCache[A]; |
| 47 | if(z!=last) |
| 48 | { |
| 49 | onemir(z); |
| 50 | last=z; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | static void toot(void) |
| 55 | { |
| 56 | int x; |
| 57 | |
| 58 | MirCache[0]=MirCache[1]=(DRegs[0]>>4)&1; |
| 59 | MirCache[2]=MirCache[3]=(DRegs[1]>>4)&1; |
| 60 | |
| 61 | for(x=0;x<4;x++) |
| 62 | MirCache[4+x]=(DRegs[2+x]>>5)&1; |
| 63 | onemir(MirCache[lastA]); |
| 64 | } |
| 65 | |
| 66 | static DECLFW(Mapper95_write) |
| 67 | { |
| 68 | switch(A&0xF001) |
| 69 | { |
| 70 | |
| 71 | case 0x8000: |
| 72 | cmd = V; |
| 73 | break; |
| 74 | |
| 75 | case 0x8001: |
| 76 | switch(cmd&0x07) |
| 77 | { |
| 78 | case 0: DRegs[0]=(V&0x3F)>>1;toot();V>>=1;setchr2(0x0000,V&0x1F);break; |
| 79 | case 1: DRegs[1]=(V&0x3F)>>1;toot();V>>=1;setchr2(0x0800,V&0x1F);break; |
| 80 | case 2: DRegs[2]=V&0x3F;toot();setchr1(0x1000,V&0x1F); break; |
| 81 | case 3: DRegs[3]=V&0x3F;toot();setchr1(0x1400,V&0x1F); break; |
| 82 | case 4: DRegs[4]=V&0x3F;toot();setchr1(0x1800,V&0x1F); break; |
| 83 | case 5: DRegs[5]=V&0x3F;toot();setchr1(0x1C00,V&0x1F); break; |
| 84 | case 6: DRegs[6]=V&0x3F; |
| 85 | setprg8(0x8000,V); |
| 86 | break; |
| 87 | case 7: DRegs[7]=V&0x3F; |
| 88 | setprg8(0xA000,V); |
| 89 | break; |
| 90 | } |
| 91 | break; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | static void DBSync() |
| 96 | { |
| 97 | int x; |
| 98 | |
| 99 | setchr2(0x0000,DRegs[0]); |
| 100 | setchr2(0x0800,DRegs[1]); |
| 101 | |
| 102 | for(x=0;x<4;x++) |
| 103 | setchr1(0x1000+x*0x400,DRegs[2+x]); |
| 104 | |
| 105 | setprg8(0x8000,DRegs[6]); |
| 106 | setprg8(0xa000,DRegs[7]); |
| 107 | toot(); |
| 108 | } |
| 109 | |
| 110 | static void DBPower(void) |
| 111 | { |
| 112 | memset(DRegs,0x3F,8); |
| 113 | DRegs[0]=DRegs[1]=0x1F; |
| 114 | |
| 115 | DBSync(); |
| 116 | |
| 117 | setprg8(0xc000,0x3E); |
| 118 | setprg8(0xe000,0x3F); |
| 119 | |
| 120 | SetReadHandler(0x8000,0xffff,CartBR); |
| 121 | SetWriteHandler(0x8000,0xffff,Mapper95_write); |
| 122 | } |
| 123 | |
| 124 | static void StateRestore(int version) |
| 125 | { |
| 126 | DBSync(); |
| 127 | } |
| 128 | |
| 129 | void Mapper95_Init(CartInfo *info) |
| 130 | { |
| 131 | info->Power=DBPower; |
| 132 | AddExState(DB_StateRegs, ~0, 0, 0); |
| 133 | PPU_hook=dragonbust_ppu; |
| 134 | GameStateRestore=StateRestore; |
| 135 | } |
| 136 | |