| 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 | |