mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 06:55:05 +01:00
76 lines
1.6 KiB
C
76 lines
1.6 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"
|
||
|
|
|
||
|
|
|
||
|
|
static void FP_FASTAPASS(1) Mapper50IRQ(int a)
|
||
|
|
{
|
||
|
|
if(IRQa)
|
||
|
|
{
|
||
|
|
if(IRQCount<4096)
|
||
|
|
IRQCount+=a;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
IRQa=0;
|
||
|
|
X6502_IRQBegin(FCEU_IQEXT);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void M50Restore(int version)
|
||
|
|
{
|
||
|
|
setprg8(0xc000,mapbyte1[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLFW(M50W)
|
||
|
|
{
|
||
|
|
if((A&0xD060)==0x4020)
|
||
|
|
{
|
||
|
|
if(A&0x100)
|
||
|
|
{
|
||
|
|
IRQa=V&1;
|
||
|
|
if(!IRQa) IRQCount=0;
|
||
|
|
X6502_IRQEnd(FCEU_IQEXT);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
V=((V&1)<<2)|((V&2)>>1)|((V&4)>>1)|(V&8);
|
||
|
|
mapbyte1[0]=V;
|
||
|
|
setprg8(0xc000,V);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void Mapper50_init(void)
|
||
|
|
{
|
||
|
|
SetWriteHandler(0x4020,0x5fff,M50W);
|
||
|
|
SetReadHandler(0x6000,0xffff,CartBR);
|
||
|
|
MapStateRestore=M50Restore;
|
||
|
|
MapIRQHook=Mapper50IRQ;
|
||
|
|
|
||
|
|
setprg8(0x6000,0xF);
|
||
|
|
setprg8(0x8000,0x8);
|
||
|
|
setprg8(0xa000,0x9);
|
||
|
|
setprg8(0xc000,0x0);
|
||
|
|
setprg8(0xe000,0xB);
|
||
|
|
}
|
||
|
|
|