| 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 | //undef printf |
| 23 | |
| 24 | static int32 IRQCount,IRQLatch; |
| 25 | static uint8 IRQa,resetmode,mbia; |
| 26 | static uint8 sizer,bigbank,bigbank2; |
| 27 | |
| 28 | static uint8 DRegBuf[8],MMC3_cmd; |
| 29 | |
| 30 | static int masko8[8]={63,31,15,1,3,0,0,0}; |
| 31 | //static int masko1[8]={511,255,127,7,7,0,0,0}; |
| 32 | |
| 33 | static void swsetprg8(uint32 A, uint32 V) |
| 34 | { |
| 35 | V&=masko8[sizer&7]; |
| 36 | V|=(bigbank*2); |
| 37 | setprg8r((V/64)&15,A,V); |
| 38 | } |
| 39 | |
| 40 | static void swsetchr1(uint32 A, uint32 V) |
| 41 | { |
| 42 | if(sizer&0x20) |
| 43 | setchr1r(0x10,A,V); |
| 44 | else |
| 45 | { |
| 46 | // V&=masko1[sizer&7]; |
| 47 | V|=bigbank2*8; |
| 48 | setchr1r((V/512)&15,A,V); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static void swsetchr2(uint32 A, uint32 V) |
| 53 | { |
| 54 | if(sizer&0x20) |
| 55 | setchr2r(0x10,A,V); |
| 56 | else |
| 57 | { |
| 58 | //V&=masko1[sizer&7]>>1; |
| 59 | V|=bigbank2*4; |
| 60 | setchr2r((V/256)&15,A,V); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | static void Sup24_hb(void) |
| 65 | { |
| 66 | if(ScreenON || SpriteON) |
| 67 | { |
| 68 | resetmode=0; |
| 69 | if(IRQCount>=0) |
| 70 | { |
| 71 | IRQCount--; |
| 72 | if(IRQCount<0) |
| 73 | { |
| 74 | if(IRQa) |
| 75 | { |
| 76 | resetmode = 1; |
| 77 | X6502_IRQBegin(FCEU_IQEXT); |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | static DECLFW(Sup24IRQWrite) |
| 85 | { |
| 86 | switch(A&0xE001) |
| 87 | { |
| 88 | case 0xc000:IRQLatch=V; |
| 89 | if(resetmode==1) |
| 90 | IRQCount=IRQLatch; |
| 91 | break; |
| 92 | case 0xc001:resetmode=1; |
| 93 | IRQCount=IRQLatch; |
| 94 | break; |
| 95 | case 0xE000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT); |
| 96 | if(resetmode==1) |
| 97 | {IRQCount=IRQLatch;} |
| 98 | break; |
| 99 | case 0xE001:IRQa=1; |
| 100 | if(resetmode==1) |
| 101 | {IRQCount=IRQLatch;} |
| 102 | break; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | static INLINE void FixMMC3PRG(int V) |
| 107 | { |
| 108 | swsetprg8(0xA000,DRegBuf[7]); |
| 109 | swsetprg8(0xE000,~0); |
| 110 | if(V&0x40) |
| 111 | { |
| 112 | swsetprg8(0xC000,DRegBuf[6]); |
| 113 | swsetprg8(0x8000,~1); |
| 114 | } |
| 115 | else |
| 116 | { |
| 117 | swsetprg8(0x8000,DRegBuf[6]); |
| 118 | swsetprg8(0xC000,~1); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static INLINE void FixMMC3CHR(int V) |
| 123 | { |
| 124 | int cbase=(V&0x80)<<5; |
| 125 | swsetchr2((cbase^0x000),DRegBuf[0]>>1); |
| 126 | swsetchr2((cbase^0x800),DRegBuf[1]>>1); |
| 127 | swsetchr1(cbase^0x1000,DRegBuf[2]); |
| 128 | swsetchr1(cbase^0x1400,DRegBuf[3]); |
| 129 | swsetchr1(cbase^0x1800,DRegBuf[4]); |
| 130 | swsetchr1(cbase^0x1c00,DRegBuf[5]); |
| 131 | } |
| 132 | |
| 133 | static DECLFW(Super24hiwrite) |
| 134 | { |
| 135 | //printf("$%04x:$%02x, %d\n",A,V,scanline); |
| 136 | switch(A&0xE001) |
| 137 | { |
| 138 | case 0x8000: |
| 139 | if((V&0x40) != (MMC3_cmd&0x40)) |
| 140 | FixMMC3PRG(V); |
| 141 | if((V&0x80) != (MMC3_cmd&0x80)) |
| 142 | FixMMC3CHR(V); |
| 143 | MMC3_cmd = V; |
| 144 | break; |
| 145 | |
| 146 | case 0x8001: |
| 147 | { |
| 148 | int cbase=(MMC3_cmd&0x80)<<5; |
| 149 | DRegBuf[MMC3_cmd&0x7]=V; |
| 150 | switch(MMC3_cmd&0x07) |
| 151 | { |
| 152 | case 0: V>>=1;swsetchr2((cbase^0x000),V);break; |
| 153 | case 1: V>>=1;swsetchr2((cbase^0x800),V);break; |
| 154 | case 2: swsetchr1(cbase^0x1000,V); break; |
| 155 | case 3: swsetchr1(cbase^0x1400,V); break; |
| 156 | case 4: swsetchr1(cbase^0x1800,V); break; |
| 157 | case 5: swsetchr1(cbase^0x1C00,V); break; |
| 158 | case 6: if (MMC3_cmd&0x40) swsetprg8(0xC000,V); |
| 159 | else swsetprg8(0x8000,V); |
| 160 | break; |
| 161 | case 7: swsetprg8(0xA000,V); |
| 162 | break; |
| 163 | } |
| 164 | } |
| 165 | break; |
| 166 | |
| 167 | case 0xA000: |
| 168 | mbia=V; |
| 169 | setmirror((V&1)^1); |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | |
| 175 | DECLFW(Super24Write) |
| 176 | { |
| 177 | //printf("$%04x:$%02x\n",A,V); |
| 178 | switch(A) |
| 179 | { |
| 180 | case 0x5ff0:sizer=V; |
| 181 | FixMMC3PRG(MMC3_cmd); |
| 182 | FixMMC3CHR(MMC3_cmd); |
| 183 | break; |
| 184 | case 0x5FF1: |
| 185 | bigbank=V; |
| 186 | FixMMC3PRG(MMC3_cmd); |
| 187 | break; |
| 188 | case 0x5FF2: |
| 189 | bigbank2=V; |
| 190 | FixMMC3CHR(MMC3_cmd); |
| 191 | break; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void Super24Reset(void) |
| 196 | { |
| 197 | SetWriteHandler(0x8000,0xBFFF,Super24hiwrite); |
| 198 | SetWriteHandler(0x5000,0x7FFF,Super24Write); |
| 199 | SetWriteHandler(0xC000,0xFFFF,Sup24IRQWrite); |
| 200 | SetReadHandler(0x8000,0xFFFF,CartBR); |
| 201 | GameHBIRQHook=Sup24_hb; |
| 202 | IRQCount=IRQLatch=IRQa=resetmode=0; |
| 203 | sizer=0x24; |
| 204 | bigbank=159; |
| 205 | bigbank2=0; |
| 206 | |
| 207 | MMC3_cmd=0; |
| 208 | DRegBuf[6]=0; |
| 209 | DRegBuf[7]=1; |
| 210 | |
| 211 | FixMMC3PRG(0); |
| 212 | FixMMC3CHR(0); |
| 213 | } |
| 214 | |
| 215 | static void MrRestore(int version) |
| 216 | { |
| 217 | FixMMC3PRG(MMC3_cmd); |
| 218 | FixMMC3CHR(MMC3_cmd); |
| 219 | setmirror((mbia&1)^1); |
| 220 | } |
| 221 | |
| 222 | void Super24_Init(void) |
| 223 | { |
| 224 | BoardPower=Super24Reset; |
| 225 | SetupCartCHRMapping(0x10, GameMemBlock, 8192, 1); |
| 226 | GameStateRestore=MrRestore; |
| 227 | |
| 228 | AddExState(GameMemBlock, 8192, 0, "CHRR"); |
| 229 | AddExState(DRegBuf, 8, 0, "DREG"); |
| 230 | AddExState(&IRQCount, 4, 1, "IRQC"); |
| 231 | AddExState(&IRQLatch, 4, 1, "IQL1"); |
| 232 | AddExState(&IRQa, 1, 0, "IRQA"); |
| 233 | AddExState(&sizer, 1, 0, "SIZA"); |
| 234 | AddExState(&bigbank, 1, 0, "BIG1"); |
| 235 | AddExState(&bigbank2, 1, 0, "BIG2"); |
| 236 | } |