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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 MMC4reg mapbyte1 |
| 24 | #define latcha1 mapbyte2[0] |
| 25 | #define latcha2 mapbyte2[1] |
| 26 | |
| 27 | |
| 28 | static void FP_FASTAPASS(1) latchcheck(uint32 VAddr) |
| 29 | { |
| 30 | uint8 l,h; |
| 31 | |
| 32 | h=VAddr>>8; |
| 33 | |
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34 | if(h>=0x20 || ((h&0xF)!=0xF)) |
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35 | return; |
| 36 | |
| 37 | l=VAddr&0xF0; |
| 38 | |
| 39 | if(h<0x10) |
| 40 | { |
| 41 | if(l==0xD0) |
| 42 | { |
| 43 | VROM_BANK4(0x0000,MMC4reg[0]); |
| 44 | latcha1=0xFD; |
| 45 | } |
| 46 | else if(l==0xE0) |
| 47 | { |
| 48 | VROM_BANK4(0x0000,MMC4reg[1]); |
| 49 | latcha1=0xFE; |
| 50 | } |
| 51 | } |
| 52 | else |
| 53 | { |
| 54 | if(l==0xD0) |
| 55 | { |
| 56 | VROM_BANK4(0x1000,MMC4reg[2]); |
| 57 | latcha2=0xFD; |
| 58 | } |
| 59 | else if(l==0xE0) |
| 60 | { |
| 61 | VROM_BANK4(0x1000,MMC4reg[3]); |
| 62 | latcha2=0xFE; |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | DECLFW(Mapper9_write) // $Axxx |
| 68 | { |
| 69 | ROM_BANK8(0x8000,V); |
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70 | X6502_Rebase(); |
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71 | } |
| 72 | |
| 73 | DECLFW(Mapper10_write) |
| 74 | { |
| 75 | ROM_BANK16(0x8000,V); |
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76 | X6502_Rebase(); |
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77 | } |
| 78 | |
| 79 | DECLFW(Mapper9and10_write) |
| 80 | { |
| 81 | switch(A&0xF000) |
| 82 | { |
| 83 | case 0xB000: |
| 84 | if (latcha1==0xFD) { VROM_BANK4(0x0000,V);} |
| 85 | MMC4reg[0]=V; |
| 86 | break; |
| 87 | case 0xC000: |
| 88 | if (latcha1==0xFE) {VROM_BANK4(0x0000,V);} |
| 89 | MMC4reg[1]=V; |
| 90 | break; |
| 91 | case 0xD000: |
| 92 | if (latcha2==0xFD) {VROM_BANK4(0x1000,V);} |
| 93 | MMC4reg[2]=V; |
| 94 | break; |
| 95 | case 0xE000: |
| 96 | if (latcha2==0xFE) {VROM_BANK4(0x1000,V);} |
| 97 | MMC4reg[3]=V; |
| 98 | break; |
| 99 | case 0xF000: |
| 100 | MIRROR_SET(V&1); |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | void Mapper9_init(void) |
| 106 | { |
| 107 | latcha1=0xFE; |
| 108 | latcha2=0xFE; |
| 109 | ROM_BANK8(0xA000,~2); |
| 110 | ROM_BANK8(0x8000,0); |
| 111 | SetWriteHandler(0xA000,0xAFFF,Mapper9_write); |
| 112 | SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write); |
| 113 | PPU_hook=latchcheck; |
| 114 | } |
| 115 | |
| 116 | void Mapper10_init(void) |
| 117 | { |
| 118 | latcha1=latcha2=0xFE; |
| 119 | SetWriteHandler(0xA000,0xAFFF,Mapper10_write); |
| 120 | SetWriteHandler(0xB000,0xFFFF,Mapper9and10_write); |
| 121 | PPU_hook=latchcheck; |
| 122 | } |
| 123 | |
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