68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/* FCEUmm - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2020
|
|
*
|
|
* 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"
|
|
#include "asic_mmc3.h"
|
|
|
|
static uint8 reg;
|
|
static uint8 pad;
|
|
|
|
static DECLFR(readPad) {
|
|
return CartBR(A &~3 | pad &3);
|
|
}
|
|
|
|
static void sync() {
|
|
if (reg &0x10)
|
|
setprg32(0x8000, reg >>1);
|
|
else {
|
|
setprg16(0x8000, reg);
|
|
setprg16(0xC000, reg);
|
|
}
|
|
MMC3_syncCHR(0x7F, reg <<4 &~0x7F);
|
|
MMC3_syncMirror();
|
|
SetReadHandler(0x8000, 0xFFFF, reg &0x20? readPad: CartBR);
|
|
}
|
|
|
|
static DECLFW(writeReg) {
|
|
reg = A &0xFF;
|
|
sync();
|
|
}
|
|
|
|
static void reset() {
|
|
reg = 0;
|
|
++pad;
|
|
sync();
|
|
}
|
|
|
|
static void power() {
|
|
reg = 0;
|
|
pad = 0;
|
|
MMC3_power();
|
|
}
|
|
|
|
void Mapper503_Init(CartInfo *info) {
|
|
MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, writeReg);
|
|
info->Power = power;
|
|
info->Reset = reset;
|
|
AddExState(®, 1, 0, "EXPR");
|
|
}
|