88 lines
2.3 KiB
C
88 lines
2.3 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 submapper;
|
|
static uint8 reg[2];
|
|
static uint8 pad;
|
|
|
|
static DECLFR(readPad) {
|
|
return pad;
|
|
}
|
|
|
|
static void sync() {
|
|
int prgAND =reg[1] &0x02? 0x0F: 0x1F;
|
|
int chrAND =reg[1] &0x20 && submapper == 3? 0x1FF: reg[1] &0x04? 0x7F: 0xFF;
|
|
int prgOR =reg[1] <<4 &0x10 | reg[1] <<1 &0x60;
|
|
int chrOR =reg[1] <<7 &0x80 | reg[1] <<5 &0x100 | reg[1] <<4 &0x200;
|
|
MMC3_syncPRG(prgAND, prgOR &~prgAND);
|
|
MMC3_syncCHR(chrAND, chrOR &~chrAND);
|
|
MMC3_syncMirror();
|
|
SetReadHandler(0x8000, 0xFFFF, submapper == 1 && reg[1] &0x20 || submapper != 1 && reg[0] &0x01? readPad: CartBR);
|
|
}
|
|
|
|
static int getPRGBank(uint8 bank) {
|
|
if (reg[1] &0x40) {
|
|
int mask = reg[1] &(submapper == 2? 0x20: 0x80)? 3: 1;
|
|
return MMC3_getPRGBank(bank & 1) &~mask | bank &mask;
|
|
} else
|
|
return MMC3_getPRGBank(bank);
|
|
}
|
|
|
|
static int getCHRBank(uint8 bank) {
|
|
if (reg[1] &0x20 && submapper == 3)
|
|
return MMC3_getCHRBank(bank &6 | bank >>1 &1) <<1 | bank &1;
|
|
else
|
|
return MMC3_getCHRBank(bank);
|
|
}
|
|
|
|
static DECLFW(writeReg) {
|
|
if (submapper == 3 && reg[1] &0x80)
|
|
;
|
|
else {
|
|
reg[A &1] = V;
|
|
sync();
|
|
}
|
|
}
|
|
|
|
static void reset() {
|
|
reg[0] = reg[1] = 0;
|
|
++pad;
|
|
sync();
|
|
}
|
|
|
|
static void power() {
|
|
reg[0] = reg[1] = 0;
|
|
pad = 0;
|
|
MMC3_power();
|
|
}
|
|
|
|
void Mapper432_Init(CartInfo *info) {
|
|
submapper =info->submapper;
|
|
MMC3_init(info, sync, MMC3_TYPE_AX5202P, getPRGBank, getCHRBank, NULL, writeReg);
|
|
info->Power = power;
|
|
info->Reset = reset;
|
|
AddExState(reg, 2, 0, "EXPR");
|
|
}
|