| 1 | /* FCE Ultra - NES/Famicom Emulator\r |
| 2 | *\r |
| 3 | * Copyright notice for this file:\r |
| 4 | * Copyright (C) 2002 CaH4e3\r |
| 5 | *\r |
| 6 | * This program is free software; you can redistribute it and/or modify\r |
| 7 | * it under the terms of the GNU General Public License as published by\r |
| 8 | * the Free Software Foundation; either version 2 of the License, or\r |
| 9 | * (at your option) any later version.\r |
| 10 | *\r |
| 11 | * This program is distributed in the hope that it will be useful,\r |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of\r |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r |
| 14 | * GNU General Public License for more details.\r |
| 15 | *\r |
| 16 | * You should have received a copy of the GNU General Public License\r |
| 17 | * along with this program; if not, write to the Free Software\r |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r |
| 19 | */\r |
| 20 | \r |
| 21 | #include "mapinc.h"\r |
| 22 | \r |
| 23 | static uint8 prg_reg;\r |
| 24 | static uint8 chr_reg;\r |
| 25 | \r |
| 26 | static uint8 sim0reg, sim0bit, sim0byte, sim0parity, sim0bcnt;\r |
| 27 | static uint16 sim0data;\r |
| 28 | static uint8 sim0array[128] =\r |
| 29 | {\r |
| 30 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 31 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 32 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 33 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 34 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 35 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 36 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
| 37 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xAA,\r |
| 38 | };\r |
| 39 | \r |
| 40 | static SFORMAT StateRegs[]=\r |
| 41 | {\r |
| 42 | {&prg_reg, 1, "PREG"},\r |
| 43 | {&chr_reg, 1, "CREG"},\r |
| 44 | {0}\r |
| 45 | };\r |
| 46 | \r |
| 47 | static void Sync(void)\r |
| 48 | {\r |
| 49 | setprg32(0x8000, prg_reg);\r |
| 50 | setchr8(chr_reg);\r |
| 51 | }\r |
| 52 | \r |
| 53 | static void StateRestore(int version)\r |
| 54 | {\r |
| 55 | Sync();\r |
| 56 | }\r |
| 57 | \r |
| 58 | static DECLFW(M216WriteHi)\r |
| 59 | {\r |
| 60 | // FCEU_printf("%04x:%04x\n",A,V);\r |
| 61 | prg_reg=A&1;\r |
| 62 | chr_reg=(A&0x0E)>>1;\r |
| 63 | Sync();\r |
| 64 | }\r |
| 65 | \r |
| 66 | static DECLFW(M216Write5000)\r |
| 67 | {\r |
| 68 | // FCEU_printf("WRITE: %04x:%04x\n",A,V);\r |
| 69 | sim0reg=V;\r |
| 70 | if(!sim0reg)\r |
| 71 | {\r |
| 72 | sim0bit=sim0byte=sim0parity=0;\r |
| 73 | sim0data=sim0array[0];\r |
| 74 | sim0bcnt=0x80;\r |
| 75 | }\r |
| 76 | else if(sim0reg&0x20)\r |
| 77 | {\r |
| 78 | sim0bcnt=0x20;\r |
| 79 | }\r |
| 80 | }\r |
| 81 | \r |
| 82 | static DECLFR(M216Read5000)\r |
| 83 | {\r |
| 84 | if(sim0reg&0x60)\r |
| 85 | {\r |
| 86 | sim0reg=(sim0reg^(sim0reg<<1))&0x40;\r |
| 87 | return sim0reg;\r |
| 88 | }\r |
| 89 | else\r |
| 90 | {\r |
| 91 | uint8 sim0out=0;\r |
| 92 | if(sim0bit<8)\r |
| 93 | {\r |
| 94 | // sim0data=((sim0array[sim0byte]<<(sim0bit))&0x80)>>1;\r |
| 95 | sim0out=(sim0data&1)<<6;\r |
| 96 | sim0data>>=1;\r |
| 97 | sim0bit++;\r |
| 98 | sim0parity+=sim0data;\r |
| 99 | }\r |
| 100 | else if(sim0bit==8)\r |
| 101 | {\r |
| 102 | sim0bit++;\r |
| 103 | sim0out=sim0parity&1;\r |
| 104 | }\r |
| 105 | else if(sim0bit==9)\r |
| 106 | {\r |
| 107 | if(sim0byte==sim0bcnt)\r |
| 108 | sim0out=0x60;\r |
| 109 | else\r |
| 110 | {\r |
| 111 | sim0bit=0;\r |
| 112 | sim0byte++;\r |
| 113 | sim0data=sim0array[sim0byte];\r |
| 114 | sim0out=0;\r |
| 115 | }\r |
| 116 | }\r |
| 117 | // FCEU_printf("READ: %04x (%04x-%02x,%04x)\n",A,X.PC,sim0out,sim0byte);\r |
| 118 | return sim0out;\r |
| 119 | }\r |
| 120 | }\r |
| 121 | \r |
| 122 | static void Power(void)\r |
| 123 | {\r |
| 124 | prg_reg = 0;\r |
| 125 | chr_reg = 0;\r |
| 126 | Sync();\r |
| 127 | SetReadHandler(0x8000,0xFFFF,CartBR);\r |
| 128 | SetWriteHandler(0x8000,0xFFFF,M216WriteHi);\r |
| 129 | SetWriteHandler(0x5000,0x5000,M216Write5000);\r |
| 130 | SetReadHandler(0x5000,0x5000,M216Read5000);\r |
| 131 | }\r |
| 132 | \r |
| 133 | \r |
| 134 | void Mapper216_Init(CartInfo *info)\r |
| 135 | {\r |
| 136 | info->Power=Power;\r |
| 137 | GameStateRestore=StateRestore;\r |
| 138 | AddExState(&StateRegs, ~0, 0, 0);\r |
| 139 | }\r |