| 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include "mapinc.h" |
| 22 | |
| 23 | static uint8 is2kbank, isnot2kbank, dipreg; |
| 24 | |
| 25 | /*void Mapper83_init(void) |
| 26 | { |
| 27 | |
| 28 | } |
| 29 | */ |
| 30 | static void m83IRQHook(int a) |
| 31 | { |
| 32 | if(IRQa) |
| 33 | { |
| 34 | IRQCount-=a; |
| 35 | if(IRQCount<0) |
| 36 | { |
| 37 | X6502_IRQBegin(FCEU_IQEXT); |
| 38 | IRQa=0; |
| 39 | IRQCount=0xFFFF; |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | static DECLFW(wrlow) |
| 45 | { |
| 46 | mapbyte4[A&3]=V; |
| 47 | } |
| 48 | |
| 49 | static DECLFR(rdlow) |
| 50 | { |
| 51 | return mapbyte4[A&3]; |
| 52 | } |
| 53 | |
| 54 | static DECLFR(rd5000) |
| 55 | { |
| 56 | return dipreg; |
| 57 | } |
| 58 | |
| 59 | static void m83prg(void) |
| 60 | { |
| 61 | ROM_BANK16(0x8000,(mapbyte1[0]&0x3F)); |
| 62 | ROM_BANK16(0xC000,(mapbyte1[0]&0x30)|0xF); |
| 63 | } |
| 64 | |
| 65 | static void m83chr(void) |
| 66 | { |
| 67 | if(is2kbank&&!isnot2kbank) |
| 68 | { |
| 69 | VROM_BANK2(0x0000,mapbyte2[0]); |
| 70 | VROM_BANK2(0x0800,mapbyte2[1]); |
| 71 | VROM_BANK2(0x1000,mapbyte2[6]); |
| 72 | VROM_BANK2(0x1800,mapbyte2[7]); |
| 73 | } |
| 74 | else |
| 75 | { |
| 76 | int x; |
| 77 | for(x=0;x<8;x++) |
| 78 | VROM_BANK1(x*0x400,mapbyte2[x]|((mapbyte1[0]&0x30)<<4)); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | static DECLFW(Mapper83_write) |
| 83 | { |
| 84 | //printf("$%04x:$%02x\n",A,V); |
| 85 | switch(A) |
| 86 | { |
| 87 | case 0x8000: is2kbank = 1; |
| 88 | case 0xB000: |
| 89 | case 0xB0FF: |
| 90 | case 0xB1FF: |
| 91 | { |
| 92 | mapbyte1[0]=V; |
| 93 | m83prg(); |
| 94 | m83chr(); |
| 95 | } |
| 96 | break; |
| 97 | case 0x8100: |
| 98 | mapbyte3[0]=V&0x80; |
| 99 | switch(V&0x3) |
| 100 | { |
| 101 | case 0x00:MIRROR_SET2(1);break; |
| 102 | case 0x01:MIRROR_SET2(0);break; |
| 103 | case 0x02:onemir(0);break; |
| 104 | case 0x03:onemir(1);break; |
| 105 | } |
| 106 | break; |
| 107 | case 0x8200:IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break; |
| 108 | case 0x8201:IRQa=mapbyte3[0];IRQCount&=0xFF;IRQCount|=V<<8;break; |
| 109 | case 0x8300:ROM_BANK8(0x8000,V);break; |
| 110 | case 0x8301:ROM_BANK8(0xA000,V);break; |
| 111 | case 0x8302:ROM_BANK8(0xC000,V);break; |
| 112 | case 0x8310:mapbyte2[0]=V;m83chr();break; |
| 113 | case 0x8311:mapbyte2[1]=V;m83chr();break; |
| 114 | case 0x8312:mapbyte2[2]=V;isnot2kbank = 1;m83chr();break; // 2 mappers in one :) |
| 115 | case 0x8313:mapbyte2[3]=V;isnot2kbank = 1;m83chr();break; |
| 116 | case 0x8314:mapbyte2[4]=V;isnot2kbank = 1;m83chr();break; |
| 117 | case 0x8315:mapbyte2[5]=V;isnot2kbank = 1;m83chr();break; |
| 118 | case 0x8316:mapbyte2[6]=V;m83chr();break; |
| 119 | case 0x8317:mapbyte2[7]=V;m83chr();break; |
| 120 | case 0x8318:mapbyte1[1]=V;m83prg();break; |
| 121 | } |
| 122 | // printf("$%04x:$%02x, $%04x\n",A,V,X.PC.W); |
| 123 | |
| 124 | } |
| 125 | |
| 126 | static void m83Reset(void) |
| 127 | { |
| 128 | dipreg^=1; |
| 129 | } |
| 130 | |
| 131 | void Mapper83_init(void) |
| 132 | { |
| 133 | is2kbank = 0; |
| 134 | isnot2kbank = 0; |
| 135 | dipreg = 0; |
| 136 | ROM_BANK8(0xc000,0x1e); |
| 137 | ROM_BANK8(0xe000,0x1f); |
| 138 | |
| 139 | MapIRQHook=m83IRQHook; |
| 140 | MapperReset=m83Reset; |
| 141 | |
| 142 | SetReadHandler(0x5000,0x5000,rd5000); // title scren dip switch |
| 143 | SetReadHandler(0x5100,0x5103,rdlow); |
| 144 | SetWriteHandler(0x5100,0x5103,wrlow); |
| 145 | SetWriteHandler(0x8000,0xffff,Mapper83_write); |
| 146 | mapbyte1[1]=0xF; |
| 147 | } |