| 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 | * FDS Conversion |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include "mapinc.h" |
| 25 | |
| 26 | |
| 27 | static DECLFW(Mapper40_write) |
| 28 | { |
| 29 | switch(A&0xe000) |
| 30 | { |
| 31 | case 0x8000:IRQa=0;IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break; |
| 32 | case 0xa000:IRQa=1;break; |
| 33 | case 0xe000:ROM_BANK8(0xc000,V&7);break; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | static void FP_FASTAPASS(1) Mapper40IRQ(int a) |
| 38 | { |
| 39 | if(IRQa) |
| 40 | { |
| 41 | if(IRQCount<4096) |
| 42 | IRQCount+=a; |
| 43 | else |
| 44 | { |
| 45 | IRQa=0; |
| 46 | X6502_IRQBegin(FCEU_IQEXT); |
| 47 | } |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | void Mapper40_init(void) |
| 52 | { |
| 53 | ROM_BANK8(0x6000,(~0)-1); |
| 54 | ROM_BANK8(0x8000,(~0)-3); |
| 55 | ROM_BANK8(0xa000,(~0)-2); |
| 56 | SetWriteHandler(0x8000,0xffff,Mapper40_write); |
| 57 | SetReadHandler(0x6000,0x7fff,CartBR); |
| 58 | MapIRQHook=Mapper40IRQ; |
| 59 | } |
| 60 | |
| 61 | |