fceugx/source/fceultra/boards/79.cpp
2016-09-17 20:43:24 -07:00

62 lines
1.6 KiB
C++

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2012 CaH4e3
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "mapinc.h"
static uint8 creg, preg;
static SFORMAT StateRegs[] =
{
{ &creg, 1, "CREG" },
{ &preg, 1, "PREG" },
{ 0 }
};
static void Sync(void) {
setprg32(0x8000, preg);
setchr8(creg);
}
static DECLFW(M79Write) {
if ((A < 0x8000) && ((A ^ 0x4100) == 0)) {
preg = (V >> 3) & 1;
}
creg = V & 7;
Sync();
}
static void M79Power(void) {
preg = ~0;
Sync();
SetWriteHandler(0x4100, 0x5FFF, M79Write);
SetWriteHandler(0x8000, 0xFFFF, M79Write);
SetReadHandler(0x8000, 0xFFFF, CartBR);
}
static void StateRestore(int version) {
Sync();
}
void Mapper79_Init(CartInfo *info) {
info->Power = M79Power;
AddExState(&StateRegs, ~0, 0, 0);
GameStateRestore = StateRestore;
}