/
354.cpp
98 lines (89 loc) · 2.48 KB
/
354.cpp
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/* 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 submapper;
static SFORMAT StateRegs[] =
{
{ &latchAddr, 2, "ADDR" },
{ &latchData, 1, "DATA" },
{ 0 }
};
static void Mapper354_Sync(void)
{
int prg = latchData & 0x3F | latchAddr << 2 & 0x40 | latchAddr >> 5 & 0x80;
switch (latchAddr & 7)
{
case 0: case 4:
setprg32(0x8000, prg >> 1);
break;
case 1:
setprg16(0x8000, prg);
setprg16(0xC000, prg | 7);
break;
case 2: case 6:
setprg8(0x8000, prg << 1 | latchData >> 7);
setprg8(0xA000, prg << 1 | latchData >> 7);
setprg8(0xC000, prg << 1 | latchData >> 7);
setprg8(0xE000, prg << 1 | latchData >> 7);
break;
case 3: case 7:
setprg16(0x8000, prg);
setprg16(0xC000, prg);
break;
case 5:
setprg8(0x6000, prg << 1 | latchData >> 7);
setprg32(0x8000, prg >> 1 | 3);
break;
}
SetupCartCHRMapping(0, CHRptr[0], CHRsize[0], (latchAddr & 8) ? 0 : 1);
setchr8(0);
setmirror(latchData & 0x40 ? MI_H : MI_V);
}
static DECLFW(Mapper354_WriteLatch)
{
latchData = V;
latchAddr = A & 0xFFFF;
Mapper354_Sync();
}
static void Mapper354_Reset(void)
{
latchAddr = latchData = 0;
Mapper354_Sync();
}
static void Mapper354_Power(void)
{
latchAddr = latchData = 0;
SetReadHandler(0x6000, 0xFFFF, CartBR);
SetWriteHandler(submapper == 1 ? 0xE000 : 0xF000, 0xFFFF, Mapper354_WriteLatch);
Mapper354_Sync();
}
static void StateRestore(int version) {
Mapper354_Sync();
}
void Mapper354_Init(CartInfo *info)
{
submapper = info->submapper;
info->Power = Mapper354_Power;
info->Reset = Mapper354_Reset;
GameStateRestore = StateRestore;
AddExState(StateRegs, ~0, 0, 0);
}