mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 06:55:05 +01:00
89 lines
2.2 KiB
C++
89 lines
2.2 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "mapinc.h"
|
|
|
|
static uint8 is167, regs[4];
|
|
|
|
static SFORMAT StateRegs[] =
|
|
{
|
|
{ regs, 4, "DREG" },
|
|
{ 0 }
|
|
};
|
|
|
|
static void Sync(void) {
|
|
int base, bank;
|
|
base = ((regs[0] ^ regs[1]) & 0x10) << 1;
|
|
bank = (regs[2] ^ regs[3]) & 0x1f;
|
|
|
|
if (regs[1] & 0x08) {
|
|
bank &= 0xFE;
|
|
if (is167) {
|
|
setprg16(0x8000, base + bank + 1);
|
|
setprg16(0xC000, base + bank + 0);
|
|
} else {
|
|
setprg16(0x8000, base + bank + 0);
|
|
setprg16(0xC000, base + bank + 1);
|
|
}
|
|
} else {
|
|
if (regs[1] & 0x04) {
|
|
setprg16(0x8000, 0x1F);
|
|
setprg16(0xC000, base + bank);
|
|
} else {
|
|
setprg16(0x8000, base + bank);
|
|
if (is167)
|
|
setprg16(0xC000, 0x20);
|
|
else
|
|
setprg16(0xC000, 0x07);
|
|
}
|
|
}
|
|
setchr8(0);
|
|
}
|
|
|
|
static DECLFW(M166Write) {
|
|
regs[(A >> 13) & 0x03] = V;
|
|
Sync();
|
|
}
|
|
|
|
static void M166Power(void) {
|
|
regs[0] = regs[1] = regs[2] = regs[3] = 0;
|
|
Sync();
|
|
SetReadHandler(0x8000, 0xFFFF, CartBR);
|
|
SetWriteHandler(0x8000, 0xFFFF, M166Write);
|
|
}
|
|
|
|
static void StateRestore(int version) {
|
|
Sync();
|
|
}
|
|
|
|
void Mapper166_Init(CartInfo *info) {
|
|
is167 = 0;
|
|
info->Power = M166Power;
|
|
GameStateRestore = StateRestore;
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
|
}
|
|
|
|
void Mapper167_Init(CartInfo *info) {
|
|
is167 = 1;
|
|
info->Power = M166Power;
|
|
GameStateRestore = StateRestore;
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
|
}
|