mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
85 lines
2.0 KiB
C++
85 lines
2.0 KiB
C++
|
/* FCE Ultra - NES/Famicom Emulator
|
||
|
|
*
|
||
|
|
* Copyright notice for this file:
|
||
|
|
* Copyright (C) 2012 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 bank, mode;
|
||
|
|
static SFORMAT StateRegs[] =
|
||
|
|
{
|
||
|
|
{ &bank, 1, "BANK" },
|
||
|
|
{ &mode, 1, "MODE" },
|
||
|
|
{ 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static void Sync(void) {
|
||
|
|
if (mode & 2) {
|
||
|
|
setprg8(0x6000, ((bank & 7) << 2) | 0x23);
|
||
|
|
setprg16(0x8000, (bank << 1) | 0);
|
||
|
|
setprg16(0xC000, (bank << 1) | 1);
|
||
|
|
} else {
|
||
|
|
setprg8(0x6000, ((bank & 4) << 2) | 0x2F);
|
||
|
|
setprg16(0x8000, (bank << 1) | (mode >> 4));
|
||
|
|
setprg16(0xC000, ((bank & 0xC) << 1) | 7);
|
||
|
|
}
|
||
|
|
if (mode == 0x12)
|
||
|
|
setmirror(MI_H);
|
||
|
|
else
|
||
|
|
setmirror(MI_V);
|
||
|
|
setchr8(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLFW(M51WriteMode) {
|
||
|
|
mode = V & 0x12;
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLFW(M51WriteBank) {
|
||
|
|
bank = V & 0x0F;
|
||
|
|
if (A & 0x4000)
|
||
|
|
mode = (mode & 2) | (V & 0x10);
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
static void M51Power(void) {
|
||
|
|
bank = 0;
|
||
|
|
mode = 2;
|
||
|
|
Sync();
|
||
|
|
SetWriteHandler(0x6000, 0x7FFF, M51WriteMode);
|
||
|
|
SetWriteHandler(0x8000, 0xFFFF, M51WriteBank);
|
||
|
|
SetReadHandler(0x6000, 0xFFFF, CartBR);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void M51Reset(void) {
|
||
|
|
bank = 0;
|
||
|
|
mode = 2;
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
static void StateRestore(int version) {
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
void Mapper51_Init(CartInfo *info) {
|
||
|
|
info->Power = M51Power;
|
||
|
|
info->Reset = M51Reset;
|
||
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
||
|
|
GameStateRestore = StateRestore;
|
||
|
|
}
|