[fceu.git] / mappers / 21.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 K4buf mapbyte2
#define K4IRQ mapbyte1[1]
#define K4sel mapbyte1[0]

static int acount=0;

DECLFW(Mapper21_write)
{
	A|=((A>>5)&0xF);

	if((A&0xF000)==0xA000)
	  ROM_BANK8(0xA000,V);
	else if((A&0xF000)==0x8000)
	{
         if(K4sel&2)
          ROM_BANK8(0xC000,V);
         else
          ROM_BANK8(0x8000,V);
 	}
	else if(A>=0xb000 && A<=0xefff)
	{
	  A&=0xF006;
          {
           int x=((A>>2)&1)|((A-0xB000)>>11);

           K4buf[x]&=(0xF0)>>((A&2)<<1);
           K4buf[x]|=(V&0xF)<<((A&2)<<1);
           VROM_BANK1(x<<10,K4buf[x]);
          }
 
	}
	else switch(A&0xF006)
        {
	 case 0x9000:
        	     switch(V&0x3)
	             {
        	      case 0:MIRROR_SET(0);break;
	              case 1:MIRROR_SET(1);break;
	              case 2:onemir(0);break;
	              case 3:onemir(1);break;
         	     }
	             break;
	 case 0x9006:
	 case 0x9004:
	 case 0x9002:if((K4sel&2)!=(V&2))
        	     {
             	      uint8 swa;
	              swa=PRGBankList[0];
         	      ROM_BANK8(0x8000,PRGBankList[2]);
	              ROM_BANK8(0xc000,swa);
         	     }
	             K4sel=V;
        	     break;
	 case 0xf000:IRQLatch&=0xF0;IRQLatch|=V&0xF;break;
         case 0xf002:IRQLatch&=0x0F;IRQLatch|=V<<4;break;
	 case 0xf004:IRQCount=IRQLatch;
	             IRQa=V&2;K4IRQ=V&1;break;
	 case 0xf006:IRQa=K4IRQ;break;
 }
}
static void FP_FASTAPASS(1) KonamiIRQHook(int a)
{
  #define LCYCS 114
  if(IRQa)
   {
    acount+=a;
    if(acount>=LCYCS)
    {
     doagainbub:acount-=LCYCS;IRQCount++;
     if(IRQCount&0x100) {TriggerIRQ();IRQCount=IRQLatch;}
     if(acount>=LCYCS) goto doagainbub;
    }
 }
}

void Mapper21_init(void)
{
        SetWriteHandler(0x8000,0xffff,Mapper21_write);
        MapIRQHook=KonamiIRQHook;
}
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	#define K4buf mapbyte2
	24	#define K4IRQ mapbyte1[1]
	25	#define K4sel mapbyte1[0]
	26
	27	static int acount=0;
	28
	29	DECLFW(Mapper21_write)
	30	{
	31	A\|=((A>>5)&0xF);
	32
	33	if((A&0xF000)==0xA000)
	34	ROM_BANK8(0xA000,V);
	35	else if((A&0xF000)==0x8000)
	36	{
	37	if(K4sel&2)
	38	ROM_BANK8(0xC000,V);
	39	else
	40	ROM_BANK8(0x8000,V);
	41	}
	42	else if(A>=0xb000 && A<=0xefff)
	43	{
	44	A&=0xF006;
	45	{
	46	int x=((A>>2)&1)\|((A-0xB000)>>11);
	47
	48	K4buf[x]&=(0xF0)>>((A&2)<<1);
	49	K4buf[x]\|=(V&0xF)<<((A&2)<<1);
	50	VROM_BANK1(x<<10,K4buf[x]);
	51	}
	52
	53	}
	54	else switch(A&0xF006)
	55	{
	56	case 0x9000:
	57	switch(V&0x3)
	58	{
	59	case 0:MIRROR_SET(0);break;
	60	case 1:MIRROR_SET(1);break;
	61	case 2:onemir(0);break;
	62	case 3:onemir(1);break;
	63	}
	64	break;
65	case 0x9006:
66	case 0x9004:
67	case 0x9002:if((K4sel&2)!=(V&2))
68	{
69	uint8 swa;
70	swa=PRGBankList[0];
71	ROM_BANK8(0x8000,PRGBankList[2]);
72	ROM_BANK8(0xc000,swa);
73	}
74	K4sel=V;
75	break;
76	case 0xf000:IRQLatch&=0xF0;IRQLatch\|=V&0xF;break;
77	case 0xf002:IRQLatch&=0x0F;IRQLatch\|=V<<4;break;
78	case 0xf004:IRQCount=IRQLatch;
79	IRQa=V&2;K4IRQ=V&1;break;
80	case 0xf006:IRQa=K4IRQ;break;
81	}
82	}
83	static void FP_FASTAPASS(1) KonamiIRQHook(int a)
84	{
85	#define LCYCS 114
86	if(IRQa)
87	{
88	acount+=a;
89	if(acount>=LCYCS)
90	{
91	doagainbub:acount-=LCYCS;IRQCount++;
92	if(IRQCount&0x100) {TriggerIRQ();IRQCount=IRQLatch;}
93	if(acount>=LCYCS) goto doagainbub;
94	}
95	}
96	}
97
98	void Mapper21_init(void)
99	{
100	SetWriteHandler(0x8000,0xffff,Mapper21_write);
101	MapIRQHook=KonamiIRQHook;
102	}