| 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 | |
| 24 | |
| 25 | static void FP_FASTAPASS(1) FFEIRQHook(int a) |
| 26 | { |
| 27 | if(IRQa) |
| 28 | { |
| 29 | IRQCount+=a; |
| 30 | if(IRQCount>=0x10000) |
| 31 | { |
| 32 | X6502_IRQBegin(FCEU_IQEXT); |
| 33 | IRQa=0; |
| 34 | IRQCount=0; |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | |
| 40 | DECLFW(Mapper17_write) |
| 41 | { |
| 42 | switch(A){ |
| 43 | default: |
| 44 | break; |
| 45 | case 0x42FE: |
| 46 | onemir((V>>4)&1); |
| 47 | break; |
| 48 | case 0x42FF: |
| 49 | MIRROR_SET((V>>4)&1); |
| 50 | break; |
| 51 | case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break; |
| 52 | case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break; |
| 53 | case 0x4503:IRQCount&=0x00FF;IRQCount|=V<<8;IRQa=1;break; |
| 54 | case 0x4504: ROM_BANK8(0x8000,V);break; |
| 55 | case 0x4505: ROM_BANK8(0xA000,V);break; |
| 56 | case 0x4506: ROM_BANK8(0xC000,V);break; |
| 57 | case 0x4507: ROM_BANK8(0xE000,V);break; |
| 58 | case 0x4510: VROM_BANK1(0x0000,V);break; |
| 59 | case 0x4511: VROM_BANK1(0x0400,V);break; |
| 60 | case 0x4512: VROM_BANK1(0x0800,V);break; |
| 61 | case 0x4513: VROM_BANK1(0x0C00,V);break; |
| 62 | case 0x4514: VROM_BANK1(0x1000,V);break; |
| 63 | case 0x4515: VROM_BANK1(0x1400,V);break; |
| 64 | case 0x4516: VROM_BANK1(0x1800,V);break; |
| 65 | case 0x4517: VROM_BANK1(0x1C00,V);break; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | void Mapper17_init(void) |
| 70 | { |
| 71 | MapIRQHook=FFEIRQHook; |
| 72 | SetWriteHandler(0x4020,0x5fff,Mapper17_write); |
| 73 | } |