[fceu.git] / mappers / 41.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"


#define calreg mapbyte1[0]
#define calchr mapbyte1[1]

DECLFW(Mapper41_write)
{
 if(A<0x8000)
 {
 ROM_BANK32(A&7);
 X6502_Rebase();
 MIRROR_SET((A>>5)&1);
 calreg=A;
 calchr&=0x3;
 calchr|=(A>>1)&0xC;
 VROM_BANK8(calchr);
 }
 else if(calreg&0x4)
 {
 calchr&=0xC;
 calchr|=A&3;
 VROM_BANK8(calchr);
 }
}

void Mapper41_init(void)
{
 ROM_BANK32(0);
 SetWriteHandler(0x8000,0xffff,Mapper41_write);
 SetWriteHandler(0x6000,0x67ff,Mapper41_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	#define calreg mapbyte1[0]
	25	#define calchr mapbyte1[1]
	26
	27	DECLFW(Mapper41_write)
	28	{
	29	if(A<0x8000)
	30	{
	31	ROM_BANK32(A&7);
c0bf6f9f	32	X6502_Rebase();
c62d2810	33	MIRROR_SET((A>>5)&1);
	34	calreg=A;
	35	calchr&=0x3;
	36	calchr\|=(A>>1)&0xC;
	37	VROM_BANK8(calchr);
	38	}
	39	else if(calreg&0x4)
	40	{
	41	calchr&=0xC;
	42	calchr\|=A&3;
	43	VROM_BANK8(calchr);
	44	}
	45	}
	46
	47	void Mapper41_init(void)
	48	{
	49	ROM_BANK32(0);
	50	SetWriteHandler(0x8000,0xffff,Mapper41_write);
	51	SetWriteHandler(0x6000,0x67ff,Mapper41_write);
	52	}