| 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 | #define suntoggle mapbyte1[0] |
| 25 | |
| 26 | static DECLFW(Mapper67_write) |
| 27 | { |
| 28 | A&=0xF800; |
| 29 | if((A&0x800) && A<=0xb800) |
| 30 | { |
| 31 | VROM_BANK2((A-0x8800)>>1,V); |
| 32 | } |
| 33 | else switch(A) |
| 34 | { |
| 35 | case 0xc800: |
| 36 | case 0xc000:if(!suntoggle) |
| 37 | { |
| 38 | IRQCount&=0xFF; |
| 39 | IRQCount|=V<<8; |
| 40 | } |
| 41 | else |
| 42 | { |
| 43 | IRQCount&=0xFF00; |
| 44 | IRQCount|=V; |
| 45 | } |
| 46 | suntoggle^=1; |
| 47 | break; |
| 48 | case 0xd800:suntoggle=0;IRQa=V&0x10;X6502_IRQEnd(FCEU_IQEXT);break; |
| 49 | |
| 50 | case 0xe800:switch(V&3) |
| 51 | { |
| 52 | case 0:MIRROR_SET2(1);break; |
| 53 | case 1:MIRROR_SET2(0);break; |
| 54 | case 2:onemir(0);break; |
| 55 | case 3:onemir(1);break; |
| 56 | } |
| 57 | break; |
| 58 | case 0xf800:ROM_BANK16(0x8000,V);break; |
| 59 | } |
| 60 | } |
| 61 | static void FP_FASTAPASS(1) SunIRQHook(int a) |
| 62 | { |
| 63 | if(IRQa) |
| 64 | { |
| 65 | IRQCount-=a; |
| 66 | if(IRQCount<=0) |
| 67 | { |
| 68 | X6502_IRQBegin(FCEU_IQEXT); |
| 69 | IRQa=0; |
| 70 | IRQCount=0xFFFF; |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | void Mapper67_init(void) |
| 75 | { |
| 76 | SetWriteHandler(0x8000,0xffff,Mapper67_write); |
| 77 | MapIRQHook=SunIRQHook; |
| 78 | } |