| 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 | static DECLFW(Mapper42_write) |
| 25 | { |
| 26 | switch(A&0xe003) |
| 27 | { |
| 28 | case 0xe000:mapbyte1[0]=V;ROM_BANK8(0x6000,V&0xF); |
| 29 | X6502_Rebase();break; |
| 30 | case 0xe001:MIRROR_SET((V>>3)&1);break; |
| 31 | case 0xe002:IRQa=V&2;if(!IRQa) IRQCount=0;break; |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | static void FP_FASTAPASS(1) Mapper42IRQ(int a) |
| 36 | { |
| 37 | if(IRQa) |
| 38 | { |
| 39 | if(IRQCount<24576) |
| 40 | IRQCount+=a; |
| 41 | else |
| 42 | { |
| 43 | IRQa=0; |
| 44 | TriggerIRQ(); |
| 45 | } |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | static void Mapper42_StateRestore(int version) |
| 50 | { |
| 51 | ROM_BANK8(0x6000,mapbyte1[0]&0xF); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | void Mapper42_init(void) |
| 56 | { |
| 57 | ROM_BANK8(0x6000,0); |
| 58 | ROM_BANK32(~0); |
| 59 | SetWriteHandler(0xe000,0xffff,Mapper42_write); |
| 60 | SetReadHandler(0x6000,0x7fff,CartBR); |
| 61 | MapStateRestore=Mapper42_StateRestore; |
| 62 | MapIRQHook=Mapper42IRQ; |
| 63 | } |
| 64 | |