mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
|
/* FCE Ultra - NES/Famicom Emulator
|
||
|
|
*
|
||
|
|
* Copyright notice for this file:
|
||
|
|
* Copyright (C) 2005 CaH4e3
|
||
|
|
*
|
||
|
|
* 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 uint16 cmdreg;
|
||
|
|
static uint8 invalid_data;
|
||
|
|
static SFORMAT StateRegs[]=
|
||
|
|
{
|
||
|
|
{&invalid_data, 1, "INVD"},
|
||
|
|
{&cmdreg, 2, "CMDREG"},
|
||
|
|
{0}
|
||
|
|
};
|
||
|
|
|
||
|
|
static void Sync(void)
|
||
|
|
{
|
||
|
|
setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);
|
||
|
|
setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);
|
||
|
|
setmirror(((cmdreg&2)>>1)^1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLFR(UNL8157Read)
|
||
|
|
{
|
||
|
|
if(invalid_data&&cmdreg&0x100)
|
||
|
|
return 0xFF;
|
||
|
|
else
|
||
|
|
return CartBR(A);
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLFW(UNL8157Write)
|
||
|
|
{
|
||
|
|
cmdreg=A;
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
static void UNL8157Power(void)
|
||
|
|
{
|
||
|
|
setchr8(0);
|
||
|
|
SetWriteHandler(0x8000,0xFFFF,UNL8157Write);
|
||
|
|
SetReadHandler(0x8000,0xFFFF,UNL8157Read);
|
||
|
|
cmdreg=0x200;
|
||
|
|
invalid_data=1;
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
static void UNL8157Reset(void)
|
||
|
|
{
|
||
|
|
cmdreg=0;
|
||
|
|
invalid_data^=1;
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
static void UNL8157Restore(int version)
|
||
|
|
{
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
void UNL8157_Init(CartInfo *info)
|
||
|
|
{
|
||
|
|
info->Power=UNL8157Power;
|
||
|
|
info->Reset=UNL8157Reset;
|
||
|
|
GameStateRestore=UNL8157Restore;
|
||
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
||
|
|
}
|