[fceu.git] / boards / 222.c

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2005 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 uint16 IRQCount;
static uint8 IRQa;
static uint8 prg_reg[2];
static uint8 chr_reg[8];

static SFORMAT StateRegs[]=
{
  {&IRQCount, 2, "IRQC"},
  {&IRQa, 2, "IRQA"},
  {prg_reg, 2, "PRG"},
  {chr_reg, 8, "CHR"},
  {0}
};

static void M222IRQ(void)
{
  if(IRQa)
  {
    IRQCount++;
    if(IRQCount>=240)
    {
      X6502_IRQBegin(FCEU_IQEXT);
      IRQa=0;
    }
  }
}

static void Sync(void)
{
  setprg8(0x8000,prg_reg[0]);
  setprg8(0xA000,prg_reg[1]);
  int i;
  for(i=0; i<8; i++)
     setchr1(i<<10,chr_reg[i]);     
}

static DECLFW(M222Write)
{
  switch(A&0xF003)
  {
    case 0x8000: prg_reg[0]=V; break;
    case 0xA000: prg_reg[1]=V; break;
    case 0xB000: chr_reg[0]=V; break;
    case 0xB002: chr_reg[1]=V; break;
    case 0xC000: chr_reg[2]=V; break;
    case 0xC002: chr_reg[3]=V; break;
    case 0xD000: chr_reg[4]=V; break;
    case 0xD002: chr_reg[5]=V; break;
    case 0xE000: chr_reg[6]=V; break;
    case 0xE002: chr_reg[7]=V; break;
    case 0xF000: IRQCount=IRQa=V;
                 X6502_IRQEnd(FCEU_IQEXT);
                 break;
  }
  Sync();
}

static void M222Power(void)
{
  setprg16(0xC000,~0);
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x8000,0xFFFF,M222Write);
}

static void StateRestore(int version)
{
  Sync();
}

void Mapper222_Init(CartInfo *info)
{
  info->Power=M222Power;
  GameHBIRQHook=M222IRQ;
  GameStateRestore=StateRestore;
  AddExState(&StateRegs, ~0, 0, 0);
}
Commit	Line	Data
e2d0dd92	1	/* FCE Ultra - NES/Famicom Emulator
	2	*
	3	* Copyright notice for this file:
	4	* Copyright (C) 2005 CaH4e3
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	#include "mapinc.h"
	23
	24	static uint16 IRQCount;
	25	static uint8 IRQa;
	26	static uint8 prg_reg[2];
	27	static uint8 chr_reg[8];
	28
	29	static SFORMAT StateRegs[]=
	30	{
	31	{&IRQCount, 2, "IRQC"},
	32	{&IRQa, 2, "IRQA"},
	33	{prg_reg, 2, "PRG"},
	34	{chr_reg, 8, "CHR"},
	35	{0}
	36	};
	37
	38	static void M222IRQ(void)
	39	{
	40	if(IRQa)
	41	{
	42	IRQCount++;
	43	if(IRQCount>=240)
	44	{
	45	X6502_IRQBegin(FCEU_IQEXT);
	46	IRQa=0;
	47	}
	48	}
	49	}
	50
	51	static void Sync(void)
	52	{
	53	setprg8(0x8000,prg_reg[0]);
	54	setprg8(0xA000,prg_reg[1]);
	55	int i;
	56	for(i=0; i<8; i++)
	57	setchr1(i<<10,chr_reg[i]);
	58	}
	59
	60	static DECLFW(M222Write)
	61	{
	62	switch(A&0xF003)
	63	{
	64	case 0x8000: prg_reg[0]=V; break;
65	case 0xA000: prg_reg[1]=V; break;
66	case 0xB000: chr_reg[0]=V; break;
67	case 0xB002: chr_reg[1]=V; break;
68	case 0xC000: chr_reg[2]=V; break;
69	case 0xC002: chr_reg[3]=V; break;
70	case 0xD000: chr_reg[4]=V; break;
71	case 0xD002: chr_reg[5]=V; break;
72	case 0xE000: chr_reg[6]=V; break;
73	case 0xE002: chr_reg[7]=V; break;
74	case 0xF000: IRQCount=IRQa=V;
75	X6502_IRQEnd(FCEU_IQEXT);
76	break;
77	}
78	Sync();
79	}
80
81	static void M222Power(void)
82	{
83	setprg16(0xC000,~0);
84	SetReadHandler(0x8000,0xFFFF,CartBR);
85	SetWriteHandler(0x8000,0xFFFF,M222Write);
86	}
87
88	static void StateRestore(int version)
89	{
90	Sync();
91	}
92
93	void Mapper222_Init(CartInfo *info)
94	{
95	info->Power=M222Power;
96	GameHBIRQHook=M222IRQ;
97	GameStateRestore=StateRestore;
98	AddExState(&StateRegs, ~0, 0, 0);
99	}