mirror of
https://github.com/dborth/fceugx.git
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109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
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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) 2007 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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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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static uint8 prg, mirr, prgmode;
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static uint8 *WRAM=NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[]=
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{
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{&prg, 1, "REGS"},
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{&mirr, 1, "MIRR"},
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{&prgmode, 1, "MIRR"},
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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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setmirror(mirr);
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setprg8r(0x10,0x6000,0);
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setchr8(0);
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if(prgmode)
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setprg32(0x8000,prg&7);
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else {
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setprg16(0x8000,prg&0x0f);
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setprg16(0xC000,0);
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}
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}
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static DECLFW(UNLD2000Write)
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{
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// FCEU_printf("write %04x:%04x\n",A,V);
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switch(A) {
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case 0x5000: prg = V; Sync(); break;
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case 0x5200: mirr = (V & 1)^1; prgmode = V & 4; Sync(); break;
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// default: FCEU_printf("write %04x:%04x\n",A,V);
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}
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}
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static DECLFR(UNLD2000Read)
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{
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if(prg & 0x40)
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return X.DB;
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else
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return CartBR(A);
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}
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static void UNLD2000Power(void)
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{
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prg = prgmode = 0;
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Sync();
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SetReadHandler(0x6000,0x7FFF,CartBR);
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SetWriteHandler(0x6000,0x7FFF,CartBW);
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SetReadHandler(0x8000,0xFFFF,UNLD2000Read);
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SetWriteHandler(0x4020,0x5FFF,UNLD2000Write);
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}
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static void UNLAX5705IRQ(void)
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{
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if(scanline > 174) setchr4(0x0000,1);
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else setchr4(0x0000,0);
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}
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static void UNLD2000Close(void)
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{
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if(WRAM)
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FCEU_gfree(WRAM);
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WRAM=NULL;
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void UNLD2000_Init(CartInfo *info)
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{
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info->Power=UNLD2000Power;
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info->Close=UNLD2000Close;
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GameHBIRQHook=UNLAX5705IRQ;
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GameStateRestore=StateRestore;
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WRAMSIZE=8192;
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WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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AddExState(&StateRegs, ~0, 0, 0);
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}
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