[fceu.git] / mappers / 68.c

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * 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 void Fixerit(void)
{
 switch(mapbyte2[0]&3)
 {
  case 0:vnapage[0]=vnapage[2]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
         vnapage[1]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
         break;
  case 1:vnapage[0]=vnapage[1]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
         vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
         break;
  case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
         break;
  case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
         break;
 }
}

DECLFW(Mapper68_write)
{
 A&=0xF000;

 if(A>=0x8000 && A<=0xB000)
 {
  VROM_BANK2((A-0x8000)>>1,V);
 }
 else switch(A)
 {
  case 0xc000:mapbyte1[0]=V;
              if(VROM_size && mapbyte2[0]&0x10)
               Fixerit();
              break;

  case 0xd000:mapbyte1[1]=V;
              if(VROM_size && mapbyte2[0]&0x10)
               Fixerit();
              break;

  case 0xe000: mapbyte2[0]=V;
               if(!(V&0x10))
               {
                switch(V&3)
                {
                 case 0:MIRROR_SET2(1);break;
                 case 1:MIRROR_SET2(0);break;
                 case 2:onemir(0);break;
                 case 3:onemir(1);break;
                }
               }
               else if(VROM_size)
               {
                Fixerit();
                PPUNTARAM=0;
               }
               break;
  case 0xf000: ROM_BANK16(0x8000,V);break;
 }
}

static void Mapper68_StateRestore(int version)
{
              if(!(mapbyte2[0]&0x10))
              {
               switch(mapbyte2[0]&3)
               {
                case 0:MIRROR_SET(0);break;
                case 1:MIRROR_SET(1);break;
                case 2:onemir(0);break;
                case 3:onemir(1);break;
               }
              }
              else if(VROM_size)
              {
                Fixerit();
                PPUNTARAM=0;
              }
}

void Mapper68_init(void)
{
 SetWriteHandler(0x8000,0xffff,Mapper68_write);
 MapStateRestore=Mapper68_StateRestore;
}
Commit	Line	Data
c62d2810	1	/* FCE Ultra - NES/Famicom Emulator
	2	*
	3	* Copyright notice for this file:
d97315ac	4	* Copyright (C) 2002 Xodnizel
c62d2810	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	static void Fixerit(void)
	24	{
	25	switch(mapbyte2[0]&3)
	26	{
d97315ac	27	case 0:vnapage[0]=vnapage[2]=CHRptr[0]+(((mapbyte1[0]\|128)&CHRmask1[0])<<10);
	28	vnapage[1]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]\|128)&CHRmask1[0])<<10);
	29	break;
	30	case 1:vnapage[0]=vnapage[1]=CHRptr[0]+(((mapbyte1[0]\|128)&CHRmask1[0])<<10);
	31	vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]\|128)&CHRmask1[0])<<10);
	32	break;
	33	case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[0]\|128)&CHRmask1[0])<<10);
	34	break;
	35	case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]\|128)&CHRmask1[0])<<10);
c62d2810	36	break;
c62d2810	37	}
	38	}
	39
	40	DECLFW(Mapper68_write)
	41	{
	42	A&=0xF000;
	43
	44	if(A>=0x8000 && A<=0xB000)
	45	{
	46	VROM_BANK2((A-0x8000)>>1,V);
	47	}
	48	else switch(A)
	49	{
	50	case 0xc000:mapbyte1[0]=V;
	51	if(VROM_size && mapbyte2[0]&0x10)
d97315ac	52	Fixerit();
c62d2810	53	break;
	54
	55	case 0xd000:mapbyte1[1]=V;
d97315ac	56	if(VROM_size && mapbyte2[0]&0x10)
d97315ac	57	Fixerit();
c62d2810	58	break;
	59
	60	case 0xe000: mapbyte2[0]=V;
	61	if(!(V&0x10))
	62	{
	63	switch(V&3)
	64	{
	65	case 0:MIRROR_SET2(1);break;
	66	case 1:MIRROR_SET2(0);break;
	67	case 2:onemir(0);break;
	68	case 3:onemir(1);break;
	69	}
	70	}
	71	else if(VROM_size)
d97315ac	72	{
	73	Fixerit();
	74	PPUNTARAM=0;
	75	}
c62d2810	76	break;
d97315ac	77	case 0xf000: ROM_BANK16(0x8000,V);break;
c62d2810	78	}
	79	}
	80
	81	static void Mapper68_StateRestore(int version)
	82	{
	83	if(!(mapbyte2[0]&0x10))
	84	{
	85	switch(mapbyte2[0]&3)
	86	{
	87	case 0:MIRROR_SET(0);break;
	88	case 1:MIRROR_SET(1);break;
	89	case 2:onemir(0);break;
	90	case 3:onemir(1);break;
	91	}
	92	}
	93	else if(VROM_size)
	94	{
d97315ac	95	Fixerit();
c62d2810	96	PPUNTARAM=0;
	97	}
	98	}
	99
	100	void Mapper68_init(void)
	101	{
	102	SetWriteHandler(0x8000,0xffff,Mapper68_write);
	103	MapStateRestore=Mapper68_StateRestore;
	104	}