| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2002 Xodnizel |
| 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 r1 mapbyte1[0] |
| 24 | #define r2 mapbyte1[1] |
| 25 | |
| 26 | static void DoBS(void) |
| 27 | { |
| 28 | if(r1&0x40) |
| 29 | { |
| 30 | ROM_BANK32((r1&0xE)|(r2&1)); |
| 31 | VROM_BANK8( ((r1&0xE)<<2) | ((r2>>4)&7) ); |
| 32 | } |
| 33 | else |
| 34 | { |
| 35 | ROM_BANK32(r1&0xF); |
| 36 | VROM_BANK8( ((r1&0xF)<<2) | ((r2>>4)&3) ); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | static void R1Set(uint8 V) |
| 41 | { |
| 42 | if(r1) return; |
| 43 | r1=V; |
| 44 | MIRROR_SET(V>>7); |
| 45 | DoBS(); |
| 46 | } |
| 47 | |
| 48 | static void R2Set(uint8 V) |
| 49 | { |
| 50 | r2=V; |
| 51 | DoBS(); |
| 52 | } |
| 53 | |
| 54 | DECLFW(R1W) |
| 55 | { |
| 56 | R1Set(V); |
| 57 | } |
| 58 | |
| 59 | DECLFR(R1R) |
| 60 | { |
| 61 | uint8 r=CartBR(A); |
| 62 | R1Set(r); |
| 63 | return r; |
| 64 | } |
| 65 | |
| 66 | DECLFW(R2W) |
| 67 | { |
| 68 | R2Set(V); |
| 69 | } |
| 70 | |
| 71 | DECLFR(R2R) |
| 72 | { |
| 73 | uint8 r=CartBR(A); |
| 74 | R2Set(r); |
| 75 | return r; |
| 76 | } |
| 77 | |
| 78 | static void M15Restore(int version) |
| 79 | { |
| 80 | DoBS(); |
| 81 | MIRROR_SET(r1>>7); |
| 82 | } |
| 83 | |
| 84 | static void M15Reset(void) |
| 85 | { |
| 86 | r1=r2=0; |
| 87 | DoBS(); |
| 88 | MIRROR_SET(0); |
| 89 | } |
| 90 | |
| 91 | void Mapper234_init(void) |
| 92 | { |
| 93 | SetWriteHandler(0xff80,0xff9f,R1W); |
| 94 | SetReadHandler(0xff80,0xff9f,R1R); |
| 95 | |
| 96 | SetWriteHandler(0xffe8,0xfff7,R2W); |
| 97 | SetReadHandler(0xffe8,0xfff7,R2R); |
| 98 | |
| 99 | SetReadHandler(0x6000,0x7FFF,0); |
| 100 | SetWriteHandler(0x6000,0x7FFF,0); |
| 101 | |
| 102 | M15Reset(); |
| 103 | |
| 104 | GameStateRestore=M15Restore; |
| 105 | MapperReset=M15Reset; |
| 106 | } |
| 107 | |