86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* FCEUmm - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2019 Libretro Team
|
|
* 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
|
|
*/
|
|
|
|
/* NES 2.0 Mapper 313 is used for MMC3-based multicarts that switch
|
|
* between 128 KiB PRG-ROM/128 KiB CHR-ROM-sized games on each reset and
|
|
* thus require no additional registers.
|
|
* Its UNIF board name is BMC-RESET-TXROM.
|
|
*/
|
|
|
|
#include "mapinc.h"
|
|
#include "mmc3.h"
|
|
|
|
static uint8 submapper;
|
|
|
|
static void M313CW(uint32 A, uint8 V) {
|
|
/*FCEU_printf("CHR: A:%04x V:%02x 0:%02x\n", A, V, EXPREGS[0]);*/
|
|
uint32_t bank;
|
|
switch (submapper) {
|
|
default: bank = (EXPREGS[0] << 7) | (V & 0x7F); break;
|
|
case 1: bank = (EXPREGS[0] << 7) | (V & 0x7F); break;
|
|
case 2: bank = (EXPREGS[0] << 8) | (V & 0xFF); break;
|
|
case 3: bank = (EXPREGS[0] << 8) | (V & 0xFF); break;
|
|
case 4: bank = (EXPREGS[0] << 7) | (V & 0x7F); break;
|
|
}
|
|
setchr1(A, bank);
|
|
}
|
|
|
|
static void M313PW(uint32 A, uint8 V) {
|
|
/*FCEU_printf("PRG: A:%04x V:%02x 0:%02x\n", A, V, EXPREGS[0]);*/
|
|
uint32_t bank;
|
|
switch (submapper) {
|
|
default: bank = (EXPREGS[0] << 4) | (V & 0x0F); break;
|
|
case 1: bank = (EXPREGS[0] << 5) | (V & 0x1F); break;
|
|
case 2: bank = (EXPREGS[0] << 4) | (V & 0x0F); break;
|
|
case 3: bank = (EXPREGS[0] << 5) | (V & 0x1F); break;
|
|
case 4:
|
|
if (EXPREGS[0] == 0)
|
|
bank = (EXPREGS[0] << 5) | (V & 0x1F);
|
|
else
|
|
bank = (EXPREGS[0] << 4) | (V & 0x0F);
|
|
break;
|
|
}
|
|
setprg8(A, bank);
|
|
}
|
|
|
|
static void M313Reset(void) {
|
|
EXPREGS[0]++;
|
|
EXPREGS[0] &= 0x03;
|
|
MMC3RegReset();
|
|
}
|
|
|
|
static void M313Power(void) {
|
|
EXPREGS[0] = 0;
|
|
GenMMC3Power();
|
|
}
|
|
|
|
/* NES 2.0 313, UNIF BMC-RESET-TXROM */
|
|
void BMCRESETTXROM_Init(CartInfo *info) {
|
|
GenMMC3_Init(info, 256, 256, 8, 0);
|
|
cwrap = M313CW;
|
|
pwrap = M313PW;
|
|
submapper = info->submapper;
|
|
info->Power = M313Power;
|
|
info->Reset = M313Reset;
|
|
AddExState(&EXPREGS[0], 1, 0, "EXPR");
|
|
AddExState(&submapper, 1, 0, "SUBM");
|
|
}
|