140 lines
3.5 KiB
C++
140 lines
3.5 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) 2002 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mapinc.h"
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static uint8 prg_reg;
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static uint8 chr_reg;
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static uint8 sim0reg, sim0bit, sim0byte, sim0parity, sim0bcnt;
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static uint16 sim0data;
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static uint8 sim0array[128] =
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{
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xAA,
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};
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static SFORMAT StateRegs[]=
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{
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{&prg_reg, 1, "PREG"},
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{&chr_reg, 1, "CREG"},
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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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setprg32(0x8000, prg_reg);
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setchr8(chr_reg);
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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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static DECLFW(M216WriteHi)
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{
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// FCEU_printf("%04x:%04x\n",A,V);
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prg_reg=A&1;
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chr_reg=(A&0x0E)>>1;
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Sync();
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}
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static DECLFW(M216Write5000)
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{
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// FCEU_printf("WRITE: %04x:%04x\n",A,V);
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sim0reg=V;
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if(!sim0reg)
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{
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sim0bit=sim0byte=sim0parity=0;
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sim0data=sim0array[0];
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sim0bcnt=0x80;
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}
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else if(sim0reg&0x20)
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{
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sim0bcnt=0x20;
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}
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}
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static DECLFR(M216Read5000)
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{
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if(sim0reg&0x60)
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{
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sim0reg=(sim0reg^(sim0reg<<1))&0x40;
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return sim0reg;
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}
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else
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{
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uint8 sim0out=0;
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if(sim0bit<8)
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{
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// sim0data=((sim0array[sim0byte]<<(sim0bit))&0x80)>>1;
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sim0out=(sim0data&1)<<6;
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sim0data>>=1;
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sim0bit++;
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sim0parity+=sim0data;
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}
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else if(sim0bit==8)
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{
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sim0bit++;
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sim0out=sim0parity&1;
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}
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else if(sim0bit==9)
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{
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if(sim0byte==sim0bcnt)
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sim0out=0x60;
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else
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{
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sim0bit=0;
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sim0byte++;
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sim0data=sim0array[sim0byte];
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sim0out=0;
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}
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}
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// FCEU_printf("READ: %04x (%04x-%02x,%04x)\n",A,X.PC,sim0out,sim0byte);
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return sim0out;
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}
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}
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static void Power(void)
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{
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prg_reg = 0;
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chr_reg = 0;
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Sync();
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x8000,0xFFFF,M216WriteHi);
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SetWriteHandler(0x5000,0x5000,M216Write5000);
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SetReadHandler(0x5000,0x5000,M216Read5000);
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}
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void Mapper216_Init(CartInfo *info)
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{
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info->Power=Power;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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