| 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 | #define calreg mapbyte1[0] |
| 25 | #define calchr mapbyte1[1] |
| 26 | |
| 27 | DECLFW(Mapper41_write) |
| 28 | { |
| 29 | if(A<0x8000) |
| 30 | { |
| 31 | ROM_BANK32(A&7); |
| 32 | MIRROR_SET((A>>5)&1); |
| 33 | calreg=A; |
| 34 | calchr&=0x3; |
| 35 | calchr|=(A>>1)&0xC; |
| 36 | VROM_BANK8(calchr); |
| 37 | } |
| 38 | else if(calreg&0x4) |
| 39 | { |
| 40 | calchr&=0xC; |
| 41 | calchr|=A&3; |
| 42 | VROM_BANK8(calchr); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | void Mapper41_init(void) |
| 47 | { |
| 48 | ROM_BANK32(0); |
| 49 | SetWriteHandler(0x8000,0xffff,Mapper41_write); |
| 50 | SetWriteHandler(0x6000,0x67ff,Mapper41_write); |
| 51 | } |