| 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 ctrl mapbyte1[6] |
| 24 | |
| 25 | static void DoCHR(void) |
| 26 | { |
| 27 | int x; |
| 28 | |
| 29 | for(x=0;x<2;x++) |
| 30 | VROM_BANK2((x<<11)|((ctrl&2)<<11),mapbyte1[x]>>1); |
| 31 | for(x=0;x<4;x++) |
| 32 | VROM_BANK1((x<<10) | (((ctrl&2)^2)<<11),mapbyte1[2+x]); |
| 33 | } |
| 34 | |
| 35 | static DECLFW(Mapper82_write) |
| 36 | { |
| 37 | if(A<=0x7EF5) |
| 38 | { |
| 39 | mapbyte1[A&7]=V; |
| 40 | DoCHR(); |
| 41 | } |
| 42 | else |
| 43 | switch(A) |
| 44 | { |
| 45 | case 0x7ef6:ctrl=V&3; |
| 46 | MIRROR_SET2(V&1); |
| 47 | DoCHR(); |
| 48 | break; |
| 49 | case 0x7efa:V>>=2;mapbyte2[0]=V;ROM_BANK8(0x8000,V); |
| 50 | X6502_Rebase();break; |
| 51 | case 0x7efb:V>>=2;mapbyte2[1]=V;ROM_BANK8(0xa000,V); |
| 52 | X6502_Rebase();break; |
| 53 | case 0x7efc:V>>=2;mapbyte2[2]=V;ROM_BANK8(0xc000,V); |
| 54 | X6502_Rebase();break; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | void Mapper82_init(void) |
| 59 | { |
| 60 | ROM_BANK8(0xE000,~0); |
| 61 | |
| 62 | /* external WRAM might end at $73FF */ |
| 63 | SetWriteHandler(0x7ef0,0x7efc,Mapper82_write); |
| 64 | } |
| 65 | |