| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2003 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 PRGSel; |
| 24 | static uint8 PBuf[4],PSel; |
| 25 | static uint8 cmd; |
| 26 | static uint8 DRegs[8]; |
| 27 | static uint32 count=0; |
| 28 | static uint32 last=0; |
| 29 | |
| 30 | static DECLFW(M208Write1) |
| 31 | { |
| 32 | PRGSel=(V&0x1)|((V>>3)&0x2); |
| 33 | setprg32(0x8000,PRGSel); |
| 34 | } |
| 35 | |
| 36 | static DECLFW(M208Write2) |
| 37 | { |
| 38 | static uint8 lut[256]={ |
| 39 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09, |
| 40 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01, |
| 41 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09, |
| 42 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01, |
| 43 | 0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 44 | 0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 45 | 0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 46 | 0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 47 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08, |
| 48 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00, |
| 49 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08, |
| 50 | 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59,0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00, |
| 51 | 0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 52 | 0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 53 | 0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 54 | 0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 |
| 55 | |
| 56 | }; |
| 57 | if(A<=0x57FF) PSel=V; |
| 58 | else |
| 59 | PBuf[(A&0x03)]=V^lut[PSel]; |
| 60 | } |
| 61 | |
| 62 | static DECLFR(M208Read) |
| 63 | { |
| 64 | return(PBuf[(A&0x3)]); |
| 65 | } |
| 66 | |
| 67 | static void Sync(void) |
| 68 | { |
| 69 | int x; |
| 70 | |
| 71 | setchr2(0x0000,DRegs[0]>>1); |
| 72 | setchr2(0x0800,DRegs[1]>>1); |
| 73 | for(x=0;x<4;x++) |
| 74 | setchr1(0x1000+x*0x400,DRegs[2+x]); |
| 75 | } |
| 76 | |
| 77 | static DECLFW(M208HWrite) |
| 78 | { |
| 79 | switch(A&0xe001) |
| 80 | { |
| 81 | case 0xc000:IRQLatch=IRQCount=V;break; |
| 82 | case 0xc001:IRQCount=IRQLatch;last=count=0;break; |
| 83 | case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break; |
| 84 | case 0xe001:IRQa=1;break; |
| 85 | case 0x8000:cmd=V;break; |
| 86 | case 0x8001:DRegs[cmd&7]=V; |
| 87 | Sync(); |
| 88 | break; |
| 89 | |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static void M208Power(void) |
| 94 | { |
| 95 | PRGSel=3; |
| 96 | setprg32(0x8000,3); |
| 97 | SetWriteHandler(0x4800,0x4FFF,M208Write1); |
| 98 | SetWriteHandler(0x5000,0x5fff,M208Write2); |
| 99 | SetWriteHandler(0x8000,0xFFFF,M208HWrite); |
| 100 | SetReadHandler(0x5800,0x5FFF,M208Read); |
| 101 | SetReadHandler(0x8000,0xffff,CartBR); |
| 102 | } |
| 103 | |
| 104 | static void sl(void) |
| 105 | { |
| 106 | if(IRQa) |
| 107 | { |
| 108 | if(IRQCount>=0) |
| 109 | { |
| 110 | IRQCount--; |
| 111 | if(IRQCount<0) |
| 112 | { |
| 113 | X6502_IRQBegin(FCEU_IQEXT); |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | static void FP_FASTAPASS(1) foo(uint32 A) |
| 120 | { |
| 121 | if((A&0x2000) && !(last&0x2000)) |
| 122 | { |
| 123 | count++; |
| 124 | if(count==42) |
| 125 | { |
| 126 | sl(); |
| 127 | count=0; |
| 128 | } |
| 129 | } |
| 130 | last=A; |
| 131 | } |
| 132 | |
| 133 | void Mapper208_Init(CartInfo *info) |
| 134 | { |
| 135 | info->Power=M208Power; |
| 136 | //GameHBIRQHook=sl; |
| 137 | PPU_hook=foo; |
| 138 | } |
| 139 | |