fceux/boards/bonza.cpp

140 lines
3.5 KiB
C++

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 CaH4e3
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "mapinc.h"
static uint8 prg_reg;
static uint8 chr_reg;
static uint8 sim0reg, sim0bit, sim0byte, sim0parity, sim0bcnt;
static uint16 sim0data;
static uint8 sim0array[128] =
{
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xAA,
};
static SFORMAT StateRegs[]=
{
{&prg_reg, 1, "PREG"},
{&chr_reg, 1, "CREG"},
{0}
};
static void Sync(void)
{
setprg32(0x8000, prg_reg);
setchr8(chr_reg);
}
static void StateRestore(int version)
{
Sync();
}
static DECLFW(M216WriteHi)
{
// FCEU_printf("%04x:%04x\n",A,V);
prg_reg=A&1;
chr_reg=(A&0x0E)>>1;
Sync();
}
static DECLFW(M216Write5000)
{
// FCEU_printf("WRITE: %04x:%04x\n",A,V);
sim0reg=V;
if(!sim0reg)
{
sim0bit=sim0byte=sim0parity=0;
sim0data=sim0array[0];
sim0bcnt=0x80;
}
else if(sim0reg&0x20)
{
sim0bcnt=0x20;
}
}
static DECLFR(M216Read5000)
{
if(sim0reg&0x60)
{
sim0reg=(sim0reg^(sim0reg<<1))&0x40;
return sim0reg;
}
else
{
uint8 sim0out=0;
if(sim0bit<8)
{
// sim0data=((sim0array[sim0byte]<<(sim0bit))&0x80)>>1;
sim0out=(sim0data&1)<<6;
sim0data>>=1;
sim0bit++;
sim0parity+=sim0data;
}
else if(sim0bit==8)
{
sim0bit++;
sim0out=sim0parity&1;
}
else if(sim0bit==9)
{
if(sim0byte==sim0bcnt)
sim0out=0x60;
else
{
sim0bit=0;
sim0byte++;
sim0data=sim0array[sim0byte];
sim0out=0;
}
}
// FCEU_printf("READ: %04x (%04x-%02x,%04x)\n",A,X.PC,sim0out,sim0byte);
return sim0out;
}
}
static void Power(void)
{
prg_reg = 0;
chr_reg = 0;
Sync();
SetReadHandler(0x8000,0xFFFF,CartBR);
SetWriteHandler(0x8000,0xFFFF,M216WriteHi);
SetWriteHandler(0x5000,0x5000,M216Write5000);
SetReadHandler(0x5000,0x5000,M216Read5000);
}
void Mapper216_Init(CartInfo *info)
{
info->Power=Power;
GameStateRestore=StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}