mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
67 lines
1.5 KiB
C++
67 lines
1.5 KiB
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"
|
|
|
|
#define mode mapbyte1[0]
|
|
#define page mapbyte1[1]
|
|
|
|
static uint32 Get8K(uint32 A)
|
|
{
|
|
uint32 bank;
|
|
|
|
bank=(page<<2)|((A>>13)&1);
|
|
|
|
if(A&0x4000 && !(mode&1)) bank|=0xC;
|
|
if(!(A&0x8000)) bank|=0x20;
|
|
if(mode==2) bank|=2;
|
|
else bank|=(A>>13)&2;
|
|
return(bank);
|
|
}
|
|
|
|
static void Synco(void)
|
|
{
|
|
uint32 x;
|
|
if(mapbyte1[0]<=2)
|
|
MIRROR_SET2(1);
|
|
else
|
|
MIRROR_SET2(0);
|
|
for(x=0x6000;x<0x10000;x+=8192)
|
|
ROM_BANK8(x,Get8K(x));
|
|
}
|
|
|
|
static DECLFW(Write)
|
|
{
|
|
if(A&0x8000) mapbyte1[1]=V&0xF;
|
|
else mapbyte1[0]=(mapbyte1[0]&2)|((V>>1)&1);
|
|
|
|
if(A&0x4000) mapbyte1[0]=(mapbyte1[0]&1)|((V>>3)&2);
|
|
Synco();
|
|
}
|
|
|
|
void Mapper51_init(void)
|
|
{
|
|
SetWriteHandler(0x6000,0xFFFF,Write);
|
|
SetReadHandler(0x6000,0xFFFF,CartBR);
|
|
mapbyte1[0]=1;
|
|
mapbyte1[1]=0;
|
|
Synco();
|
|
}
|