| 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 | static DECLFW(Mapper33_write) |
| 24 | { |
| 25 | A&=0xF003; |
| 26 | |
| 27 | //printf("$%04x:$%02x, %d\n",A,V,scanline); |
| 28 | if(A>=0xA000 && A<=0xA003) |
| 29 | VROM_BANK1(0x1000+((A&3)<<10),V); |
| 30 | else switch(A){ |
| 31 | case 0x8000:if(!mapbyte1[0]) |
| 32 | MIRROR_SET((V>>6)&1); |
| 33 | ROM_BANK8(0x8000,V); |
| 34 | X6502_Rebase(); |
| 35 | break; |
| 36 | case 0x8001:ROM_BANK8(0xA000,V); |
| 37 | X6502_Rebase();break; |
| 38 | case 0x8002:VROM_BANK2(0x0000,V);break; |
| 39 | case 0x8003:VROM_BANK2(0x0800,V);break; |
| 40 | case 0xc000:IRQLatch=V;break; |
| 41 | case 0xc001:IRQCount=IRQLatch;break; |
| 42 | case 0xc003:IRQa=0;break; |
| 43 | case 0xc002:IRQa=1;break; |
| 44 | case 0xe000:mapbyte1[0]=1;MIRROR_SET((V>>6)&1);break; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | static void heho(void) |
| 49 | { |
| 50 | if(IRQa) |
| 51 | { |
| 52 | IRQCount++; |
| 53 | if(IRQCount==0x100) |
| 54 | { |
| 55 | TriggerIRQ(); |
| 56 | IRQa=0; |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | void Mapper33_init(void) |
| 62 | { |
| 63 | SetWriteHandler(0x8000,0xffff,Mapper33_write); |
| 64 | GameHBIRQHook=heho; |
| 65 | } |