[fceu.git] / mappers / 43.c

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Ben Parnell
 *
 * 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"


DECLFW(Mapper43_write)
{
  uint32 m;
  int z;

  if(A&0x400)
   onemir(0);
  else
   MIRROR_SET((A>>13)&1);
  m=A&0x1f;

  z=(A>>8)&3;

  switch(CHRmask8[0])
  {
   default:
   case 0xFF:
             if(z&2)
              m|=0x20;
             break;
   case 0x1FF:
             m|=z<<5;
             break;
  }

   if(A&0x800)
   {
    ROM_BANK16(0x8000,(m<<1)|((A&0x1000)>>12));
    ROM_BANK16(0xC000,(m<<1)|((A&0x1000)>>12));
   }
   else
    ROM_BANK32(m);
   X6502_Rebase();
}

void Mapper43_init(void)
{
 ROM_BANK32(0);
 SetWriteHandler(0x8000,0xffff,Mapper43_write);
}
Commit	Line	Data
c62d2810	1	/* FCE Ultra - NES/Famicom Emulator
	2	*
	3	* Copyright notice for this file:
	4	* Copyright (C) 2002 Ben Parnell
	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	#include "mapinc.h"
	22
	23
	24
	25	DECLFW(Mapper43_write)
	26	{
	27	uint32 m;
	28	int z;
	29
	30	if(A&0x400)
	31	onemir(0);
	32	else
	33	MIRROR_SET((A>>13)&1);
	34	m=A&0x1f;
	35
	36	z=(A>>8)&3;
	37
	38	switch(CHRmask8[0])
	39	{
	40	default:
	41	case 0xFF:
	42	if(z&2)
	43	m\|=0x20;
	44	break;
	45	case 0x1FF:
	46	m\|=z<<5;
	47	break;
	48	}
	49
	50	if(A&0x800)
	51	{
	52	ROM_BANK16(0x8000,(m<<1)\|((A&0x1000)>>12));
	53	ROM_BANK16(0xC000,(m<<1)\|((A&0x1000)>>12));
	54	}
	55	else
	56	ROM_BANK32(m);
c0bf6f9f	57	X6502_Rebase();
c62d2810	58	}
	59
	60	void Mapper43_init(void)
	61	{
	62	ROM_BANK32(0);
	63	SetWriteHandler(0x8000,0xffff,Mapper43_write);
	64	}