| d97315ac |
1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2005 CaH4e3 |
| 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 | #include "mmc3.h" |
| 23 | |
| 24 | static uint8 cmdin; |
| 25 | static uint8 UNL8237_perm[8] = {0, 2, 6, 1, 7, 3, 4, 5}; |
| 26 | |
| 27 | static void UNL8237CW(uint32 A, uint8 V) |
| 28 | { |
| 29 | setchr1(A,((EXPREGS[1]&4)<<6)|V); |
| 30 | } |
| 31 | |
| 32 | static void UNL8237PW(uint32 A, uint8 V) |
| 33 | { |
| 34 | if(EXPREGS[0]&0x80) |
| 35 | { |
| 36 | if(EXPREGS[0]&0x20) |
| 37 | setprg32(0x8000,(EXPREGS[0]&0xF)>>1); |
| 38 | else |
| 39 | { |
| 40 | setprg16(0x8000,(EXPREGS[0]&0x1F)); |
| 41 | setprg16(0xC000,(EXPREGS[0]&0x1F)); |
| 42 | } |
| 43 | } |
| 44 | else |
| 45 | setprg8(A,V&0x3F); |
| 46 | } |
| 47 | |
| 48 | static DECLFW(UNL8237Write) |
| 49 | { |
| 50 | if((A&0xF000)==0xF000) |
| 51 | IRQCount=V; |
| 52 | else if((A&0xF000)==0xE000) |
| 53 | X6502_IRQEnd(FCEU_IQEXT); |
| 54 | else switch(A&0xE001) |
| 55 | { |
| 56 | case 0x8000: setmirror(((V|(V>>7))&1)^1); break; |
| 57 | case 0xA000: MMC3_CMDWrite(0x8000,(V&0xC0)|(UNL8237_perm[V&7])); cmdin=1; break; |
| 58 | case 0xC000: if(cmdin) |
| 59 | { |
| 60 | MMC3_CMDWrite(0x8001,V); |
| 61 | cmdin=0; |
| 62 | } |
| 63 | break; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static DECLFW(UNL8237ExWrite) |
| 68 | { |
| 69 | switch(A) |
| 70 | { |
| 71 | case 0x5000: EXPREGS[0]=V; FixMMC3PRG(MMC3_cmd); break; |
| 72 | case 0x5001: EXPREGS[1]=V; FixMMC3CHR(MMC3_cmd); break; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | static void UNL8237Power(void) |
| 77 | { |
| 78 | IRQa=1; |
| 79 | EXPREGS[0]=EXPREGS[1]=0; |
| 80 | GenMMC3Power(); |
| 81 | SetWriteHandler(0x8000,0xFFFF,UNL8237Write); |
| 82 | SetWriteHandler(0x5000,0x7FFF,UNL8237ExWrite); |
| 83 | } |
| 84 | |
| 85 | void UNL8237_Init(CartInfo *info) |
| 86 | { |
| 87 | GenMMC3_Init(info, 256, 256, 0, 0); |
| 88 | cwrap=UNL8237CW; |
| 89 | pwrap=UNL8237PW; |
| 90 | info->Power=UNL8237Power; |
| 91 | AddExState(EXPREGS, 3, 0, "EXPR"); |
| 92 | AddExState(&cmdin, 1, 0, "CMDIN"); |
| 93 | } |
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