| 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 | #define tkcom1 mapbyte1[1] |
| 24 | #define tkcom2 mapbyte1[2] |
| 25 | |
| 26 | #define prgb mapbyte2 |
| 27 | #define unkl (mapbyte2+4) |
| 28 | #define chrlow mapbyte3 |
| 29 | #define chrhigh mapbyte4 |
| 30 | |
| 31 | static uint8 tekker=0x80; |
| 32 | |
| 33 | static DECLFR(tekread) |
| 34 | { |
| 35 | return tekker; |
| 36 | } |
| 37 | |
| 38 | static void tekprom(void) |
| 39 | { |
| 40 | switch(tkcom1&3) |
| 41 | { |
| 42 | case 1: // 16 KB |
| 43 | ROM_BANK16(0x8000,prgb[0]); |
| 44 | ROM_BANK16(0xC000,prgb[2]); |
| 45 | break; |
| 46 | |
| 47 | case 2: //2 = 8 KB ?? |
| 48 | case 3: |
| 49 | ROM_BANK8(0x8000,prgb[0]); |
| 50 | ROM_BANK8(0xa000,prgb[1]); |
| 51 | ROM_BANK8(0xc000,prgb[2]); |
| 52 | ROM_BANK8(0xe000,prgb[3]); |
| 53 | break; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | static void tekvrom(void) |
| 58 | { |
| 59 | int x; |
| 60 | switch(tkcom1&0x18) |
| 61 | { |
| 62 | case 0x00: // 8KB |
| 63 | VROM_BANK8(chrlow[0]|(chrhigh[0]<<8)); |
| 64 | break; |
| 65 | case 0x08: // 4KB |
| 66 | for(x=0;x<8;x+=4) |
| 67 | VROM_BANK4(x<<10,chrlow[x]|(chrhigh[x]<<8)); |
| 68 | break; |
| 69 | case 0x10: // 2KB |
| 70 | for(x=0;x<8;x+=2) |
| 71 | VROM_BANK2(x<<10,chrlow[x]|(chrhigh[x]<<8)); |
| 72 | break; |
| 73 | case 0x18: // 1KB |
| 74 | for(x=0;x<8;x++) |
| 75 | VROM_BANK1(x<<10,chrlow[x]|(chrhigh[x]<<8)); |
| 76 | break; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | static DECLFW(Mapper90_write) |
| 81 | { |
| 82 | A&=0xF007; |
| 83 | |
| 84 | if(A>=0x8000 && A<=0x8003) |
| 85 | { |
| 86 | prgb[A&3]=V; |
| 87 | tekprom(); |
| 88 | } |
| 89 | else if(A>=0x9000 && A<=0x9007) |
| 90 | { |
| 91 | chrlow[A&7]=V; |
| 92 | tekvrom(); |
| 93 | } |
| 94 | else if(A>=0xa000 && A<=0xa007) |
| 95 | { |
| 96 | chrhigh[A&7]=V; |
| 97 | tekvrom(); |
| 98 | } |
| 99 | else if(A>=0xb000 && A<=0xb003) |
| 100 | { |
| 101 | unkl[A&3]=V; |
| 102 | } |
| 103 | else switch(A) |
| 104 | { |
| 105 | case 0xc004: |
| 106 | case 0xc000:IRQLatch=V;break; |
| 107 | |
| 108 | case 0xc005: |
| 109 | case 0xc001:X6502_IRQEnd(FCEU_IQEXT); |
| 110 | IRQCount=V;break; |
| 111 | case 0xc006: |
| 112 | case 0xc002:X6502_IRQEnd(FCEU_IQEXT); |
| 113 | IRQa=0; |
| 114 | IRQCount=IRQLatch; |
| 115 | break; |
| 116 | case 0xc007: |
| 117 | case 0xc003:IRQa=1;break; |
| 118 | |
| 119 | case 0xd000:tkcom1=V;break; |
| 120 | case 0xd001:switch(V&3){ |
| 121 | case 0x00:MIRROR_SET(0);break; |
| 122 | case 0x01:MIRROR_SET(1);break; |
| 123 | case 0x02:onemir(0);break; |
| 124 | case 0x03:onemir(1);break; |
| 125 | } |
| 126 | break; |
| 127 | break; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | static void Mapper90_hb(void) |
| 132 | { |
| 133 | if(IRQa) |
| 134 | { |
| 135 | if(IRQCount) |
| 136 | { |
| 137 | IRQCount--; |
| 138 | if(!IRQCount) |
| 139 | { |
| 140 | X6502_IRQBegin(FCEU_IQEXT); |
| 141 | IRQCount=IRQLatch; |
| 142 | } |
| 143 | } |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | void Mapper90_init(void) |
| 148 | { |
| 149 | tekker^=0x80; |
| 150 | SetWriteHandler(0x8000,0xffff,Mapper90_write); |
| 151 | SetReadHandler(0x5000,0x5000,tekread); |
| 152 | GameHBIRQHook=Mapper90_hb; |
| 153 | } |
| 154 | |