| 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 | |
| 24 | |
| 25 | DECLFW(Mapper43_write) |
| 26 | { |
| 27 | uint32 m; |
| 28 | int z; |
| 29 | |
| 30 | if(A&0x400) |
| 31 | onemir(0); |
| 32 | else |
| 33 | MIRROR_SET((A>>13)&1); |
| 34 | m=A&0x1f; |
| 35 | |
| 36 | z=(A>>8)&3; |
| 37 | |
| 38 | switch(CHRmask8[0]) |
| 39 | { |
| 40 | default: |
| 41 | case 0xFF: |
| 42 | if(z&2) |
| 43 | m|=0x20; |
| 44 | break; |
| 45 | case 0x1FF: |
| 46 | m|=z<<5; |
| 47 | break; |
| 48 | } |
| 49 | |
| 50 | if(A&0x800) |
| 51 | { |
| 52 | ROM_BANK16(0x8000,(m<<1)|((A&0x1000)>>12)); |
| 53 | ROM_BANK16(0xC000,(m<<1)|((A&0x1000)>>12)); |
| 54 | } |
| 55 | else |
| 56 | ROM_BANK32(m); |
| 57 | } |
| 58 | |
| 59 | void Mapper43_init(void) |
| 60 | { |
| 61 | ROM_BANK32(0); |
| 62 | SetWriteHandler(0x8000,0xffff,Mapper43_write); |
| 63 | } |