mirror of
https://github.com/dborth/fceugx.git
synced 2024-12-27 09:01:56 +01:00
91 lines
2.2 KiB
C
91 lines
2.2 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 cmd mapbyte1[0]
|
|
#define lpa mapbyte1[1]
|
|
#define prgl mapbyte2
|
|
|
|
static void PRGSynco(void)
|
|
{
|
|
if(lpa&0x80)
|
|
{
|
|
ROM_BANK16(0x8000,lpa&0xF);
|
|
}
|
|
else
|
|
{
|
|
ROM_BANK8(0x8000,prgl[0]&0x1F);
|
|
ROM_BANK8(0xa000,prgl[1]&0x1F);
|
|
}
|
|
}
|
|
|
|
static DECLFW(Mapper248_writelow)
|
|
{
|
|
lpa=V;
|
|
PRGSynco();
|
|
}
|
|
|
|
static DECLFW(Mapper248_write)
|
|
{
|
|
switch(A&0xF001)
|
|
{
|
|
case 0xa000:MIRROR_SET(V&1);break; // Not sure if this is right. Mirroring may be hard wired...
|
|
case 0xc000:IRQLatch=V;break;
|
|
case 0xc001:IRQCount=IRQLatch;break;
|
|
case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
|
|
case 0xe001:IRQa=1;break;
|
|
case 0x8000:cmd=V;break;
|
|
case 0x8001:switch(cmd&7)
|
|
{
|
|
case 0:VROM_BANK2(0x000,V>>1);break;
|
|
case 1:VROM_BANK2(0x800,V>>1);break;
|
|
case 2:VROM_BANK1(0x1000,V);break;
|
|
case 3:VROM_BANK1(0x1400,V);break;
|
|
case 4:VROM_BANK1(0x1800,V);break;
|
|
case 5:VROM_BANK1(0x1c00,V);break;
|
|
case 6:prgl[0]=V;PRGSynco();break;
|
|
case 7:prgl[1]=V;PRGSynco();break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void Mapper248_hb(void)
|
|
{
|
|
if(IRQa)
|
|
{
|
|
IRQCount--;
|
|
if(IRQCount<0)
|
|
{
|
|
X6502_IRQBegin(FCEU_IQEXT);
|
|
IRQCount=IRQLatch;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Mapper248_init(void)
|
|
{
|
|
SetWriteHandler(0x6000,0x6fff,Mapper248_writelow);
|
|
SetWriteHandler(0x8000,0xffff,Mapper248_write);
|
|
GameHBIRQHook=Mapper248_hb;
|
|
}
|
|
|