1 /* FCE Ultra - NES/Famicom Emulator
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3 * Copyright notice for this file:
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4 * Copyright (C) 2012 CaH4e3
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6 * This program is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 2 of the License, or
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9 * (at your option) any later version.
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11 * This program is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program; if not, write to the Free Software
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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23 static uint8 preg[4], creg[8];
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24 static uint8 IRQa, mirr;
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25 static int32 IRQCount, IRQLatch;
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27 static SFORMAT StateRegs[]=
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33 {&IRQCount, 4, "IRQC"},
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34 {&IRQLatch, 4, "IRQL"},
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38 static void Sync(void)
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41 for(i=0; i<8; i++) setchr1(i<<10,creg[i]);
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42 setprg8(0x8000,preg[0]);
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43 setprg8(0xA000,preg[1]);
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44 setprg8(0xC000,preg[2]);
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49 setmirror(mirr & 1);
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52 static DECLFW(M18WriteIRQ)
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54 switch(A & 0xF003) {
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55 case 0xE000: IRQLatch&=0xFFF0; IRQLatch|=(V&0x0f)<<0x0;break;
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56 case 0xE001: IRQLatch&=0xFF0F; IRQLatch|=(V&0x0f)<<0x4; break;
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57 case 0xE002: IRQLatch&=0xF0FF; IRQLatch|=(V&0x0f)<<0x8; break;
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58 case 0xE003: IRQLatch&=0x0FFF; IRQLatch|=(V&0x0f)<<0xC; break;
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59 case 0xF000: IRQCount=IRQLatch; break;
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60 case 0xF001: IRQa=V&1; X6502_IRQEnd(FCEU_IQEXT); break;
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61 case 0xF002: mirr = V&3; Sync(); break;
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65 static DECLFW(M18WritePrg)
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67 uint32 i = ((A >> 1) & 1)|((A - 0x8000) >> 11);
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68 preg[i] &= (0xF0) >> ((A & 1) << 2);
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69 preg[i] |= (V & 0xF) << ((A & 1) << 2);
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73 static DECLFW(M18WriteChr)
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75 uint32 i = ((A >> 1) & 1)|((A - 0xA000) >> 11);
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76 creg[i] &= (0xF0) >> ((A & 1) << 2);
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77 creg[i] |= (V & 0xF) << ((A & 1) << 2);
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81 static void M18Power(void)
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88 SetReadHandler(0x8000,0xFFFF,CartBR);
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89 SetWriteHandler(0x8000,0x9FFF,M18WritePrg);
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90 SetWriteHandler(0xA000,0xDFFF,M18WriteChr);
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91 SetWriteHandler(0xE000,0xFFFF,M18WriteIRQ);
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94 static void FP_FASTAPASS(1) M18IRQHook(int a)
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96 if(IRQa && IRQCount)
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101 X6502_IRQBegin(FCEU_IQEXT);
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108 static void StateRestore(int version)
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113 void Mapper18_Init(CartInfo *info)
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115 info->Power=M18Power;
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116 MapIRQHook=M18IRQHook;
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117 GameStateRestore=StateRestore;
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119 AddExState(&StateRegs, ~0, 0, 0);
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