2009-07-17 19:27:04 +02:00
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2005 CaH4e3
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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2012-12-14 18:18:20 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2009-07-17 19:27:04 +02:00
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*/
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#include "mapinc.h"
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static uint16 cmdreg;
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static uint8 invalid_data;
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static SFORMAT StateRegs[]=
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{
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2012-12-14 18:18:20 +01:00
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{&invalid_data, 1, "INVD"},
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{&cmdreg, 2, "CREG"},
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2009-07-17 19:27:04 +02:00
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{0}
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};
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static void Sync(void)
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{
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setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);
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setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);
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setmirror(((cmdreg&2)>>1)^1);
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}
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static DECLFR(UNL8157Read)
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{
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if(invalid_data&&cmdreg&0x100)
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return 0xFF;
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else
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return CartBR(A);
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}
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static DECLFW(UNL8157Write)
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{
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cmdreg=A;
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Sync();
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}
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static void UNL8157Power(void)
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{
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setchr8(0);
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SetWriteHandler(0x8000,0xFFFF,UNL8157Write);
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SetReadHandler(0x8000,0xFFFF,UNL8157Read);
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cmdreg=0x200;
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invalid_data=1;
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Sync();
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}
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static void UNL8157Reset(void)
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{
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cmdreg=0;
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invalid_data^=1;
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Sync();
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}
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static void UNL8157Restore(int version)
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{
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Sync();
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}
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void UNL8157_Init(CartInfo *info)
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{
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info->Power=UNL8157Power;
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info->Reset=UNL8157Reset;
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GameStateRestore=UNL8157Restore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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