95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/* FCEUmm - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2022
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "mapinc.h"
|
|
|
|
static uint16 latchAddr;
|
|
static uint8 latchData;
|
|
static uint8 dipswitch;
|
|
|
|
static SFORMAT StateRegs[] =
|
|
{
|
|
{ &latchAddr, 2, "ADDR" },
|
|
{ &latchData, 1, "DATA" },
|
|
{ &latchData, 1, "DIPS" },
|
|
{ 0 }
|
|
};
|
|
|
|
static void Mapper449_Sync(void)
|
|
{
|
|
int prg =latchAddr >>2 &0x1F | latchAddr >>3 &0x20;
|
|
if (~latchAddr &0x080)
|
|
{
|
|
setprg16(0x8000, prg);
|
|
setprg16(0xC000, prg |7);
|
|
}
|
|
else
|
|
{
|
|
if (latchAddr &0x001)
|
|
{
|
|
setprg32(0x8000, prg >>1);
|
|
}
|
|
else
|
|
{
|
|
setprg16(0x8000, prg);
|
|
setprg16(0xC000, prg);
|
|
}
|
|
}
|
|
setchr8(latchData);
|
|
setmirror(latchAddr &0x002? MI_H: MI_V);
|
|
}
|
|
|
|
static DECLFR(Mapper449_Read)
|
|
{
|
|
if (latchAddr &0x200)
|
|
return CartBR(A | dipswitch);
|
|
else
|
|
return CartBR(A);
|
|
}
|
|
|
|
static DECLFW(Mapper449_WriteLatch)
|
|
{
|
|
latchData =V;
|
|
latchAddr =A &0xFFFF;
|
|
Mapper449_Sync();
|
|
}
|
|
|
|
static void Mapper449_Reset(void)
|
|
{
|
|
dipswitch =(dipswitch +1) &0xF;
|
|
latchAddr =latchData =0;
|
|
Mapper449_Sync();
|
|
}
|
|
|
|
static void Mapper449_Power(void)
|
|
{
|
|
dipswitch =latchAddr =latchData =0;
|
|
Mapper449_Sync();
|
|
SetWriteHandler(0x8000, 0xFFFF, Mapper449_WriteLatch);
|
|
SetReadHandler(0x6000, 0x7FFF, CartBR);
|
|
SetReadHandler(0x8000, 0xFFFF, Mapper449_Read);
|
|
}
|
|
|
|
void Mapper449_Init(CartInfo *info)
|
|
{
|
|
info->Power = Mapper449_Power;
|
|
info->Reset = Mapper449_Reset;
|
|
AddExState(StateRegs, ~0, 0, 0);
|
|
} |