| 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 | static void Fixerit(void) |
| 24 | { |
| 25 | switch(mapbyte2[0]&3) |
| 26 | { |
| 27 | case 0:vnapage[0]=vnapage[2]=VROM+(((mapbyte1[0]|128)&CHRmask1[0])<<10); |
| 28 | vnapage[1]=vnapage[3]=VROM+(((mapbyte1[1]|128)&CHRmask1[0])<<10); |
| 29 | break; |
| 30 | case 1:vnapage[0]=vnapage[1]=VROM+(((mapbyte1[0]|128)&CHRmask1[0])<<10); |
| 31 | vnapage[2]=vnapage[3]=VROM+(((mapbyte1[1]|128)&CHRmask1[0])<<10); |
| 32 | break; |
| 33 | case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=VROM+(((mapbyte1[0]|128)&CHRmask1[0])<<10); |
| 34 | break; |
| 35 | case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=VROM+(((mapbyte1[1]|128)&CHRmask1[0])<<10); |
| 36 | break; |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | DECLFW(Mapper68_write) |
| 41 | { |
| 42 | A&=0xF000; |
| 43 | |
| 44 | if(A>=0x8000 && A<=0xB000) |
| 45 | { |
| 46 | VROM_BANK2((A-0x8000)>>1,V); |
| 47 | } |
| 48 | else switch(A) |
| 49 | { |
| 50 | case 0xc000:mapbyte1[0]=V; |
| 51 | if(VROM_size && mapbyte2[0]&0x10) |
| 52 | Fixerit(); |
| 53 | break; |
| 54 | |
| 55 | case 0xd000:mapbyte1[1]=V; |
| 56 | if(VROM_size && mapbyte2[0]&0x10) |
| 57 | Fixerit(); |
| 58 | break; |
| 59 | |
| 60 | case 0xe000: mapbyte2[0]=V; |
| 61 | if(!(V&0x10)) |
| 62 | { |
| 63 | switch(V&3) |
| 64 | { |
| 65 | case 0:MIRROR_SET2(1);break; |
| 66 | case 1:MIRROR_SET2(0);break; |
| 67 | case 2:onemir(0);break; |
| 68 | case 3:onemir(1);break; |
| 69 | } |
| 70 | } |
| 71 | else if(VROM_size) |
| 72 | { |
| 73 | Fixerit(); |
| 74 | PPUNTARAM=0; |
| 75 | } |
| 76 | break; |
| 77 | case 0xf000: ROM_BANK16(0x8000,V); |
| 78 | X6502_Rebase();break; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | static void Mapper68_StateRestore(int version) |
| 83 | { |
| 84 | if(!(mapbyte2[0]&0x10)) |
| 85 | { |
| 86 | switch(mapbyte2[0]&3) |
| 87 | { |
| 88 | case 0:MIRROR_SET(0);break; |
| 89 | case 1:MIRROR_SET(1);break; |
| 90 | case 2:onemir(0);break; |
| 91 | case 3:onemir(1);break; |
| 92 | } |
| 93 | } |
| 94 | else if(VROM_size) |
| 95 | { |
| 96 | Fixerit(); |
| 97 | PPUNTARAM=0; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | void Mapper68_init(void) |
| 102 | { |
| 103 | SetWriteHandler(0x8000,0xffff,Mapper68_write); |
| 104 | MapStateRestore=Mapper68_StateRestore; |
| 105 | } |