48d548d23b
Mapper 45: Only apply outer bank bits that are unaffected by the inner bank. Mapper 45: Add PRG /CE-based menu selection.
76 lines
2.2 KiB
C
76 lines
2.2 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 "mmc3.h"
|
|
|
|
static void M432CW(uint32 A, uint8 V) {
|
|
int chrAND = (EXPREGS[1] & 0x04) ? 0x7F : 0xFF;
|
|
int chrOR = (EXPREGS[1] << 7) & 0x080 | (EXPREGS[1] << 5) & 0x100;
|
|
setchr1(A, (V & chrAND) | (chrOR & ~chrAND));
|
|
}
|
|
|
|
static void M432PW(uint32 A, uint8 V) {
|
|
int prgAND = (EXPREGS[1] & 0x02) ? 0x0F : 0x1F;
|
|
int prgOR = ((EXPREGS[1] << 4) & 0x10) | (EXPREGS[1] << 1) & 0x20;
|
|
if ((A < 0xC000) || (~EXPREGS[1] & 0x40)) setprg8(A, (V & prgAND) | (prgOR & ~prgAND) & (EXPREGS[1] & 0x80?~2:~0));
|
|
if ((A < 0xC000) && (EXPREGS[1] & 0x40)) setprg8(A | 0x4000, (V & prgAND) | (prgOR & ~prgAND) | (EXPREGS[1] & 0x80? 2: 0));
|
|
}
|
|
|
|
static DECLFR(M432Read) {
|
|
if (EXPREGS[0] & 1 || EXPREGS[1] & 0x20)
|
|
return EXPREGS[2];
|
|
return CartBR(A);
|
|
}
|
|
|
|
static DECLFW(M432Write) {
|
|
EXPREGS[A & 1] = V;
|
|
if (~A &1 && ~V &1) EXPREGS[1] =0; /* Writing 0 to register 0 clears register 1 */
|
|
FixMMC3PRG(MMC3_cmd);
|
|
FixMMC3CHR(MMC3_cmd);
|
|
}
|
|
|
|
static void M432Reset(void) {
|
|
EXPREGS[0] = 0;
|
|
EXPREGS[1] = 0;
|
|
EXPREGS[2]++;
|
|
MMC3RegReset();
|
|
}
|
|
|
|
static void M432Power(void) {
|
|
EXPREGS[0] = 0;
|
|
EXPREGS[1] = 0;
|
|
EXPREGS[2] = 0;
|
|
GenMMC3Power();
|
|
SetReadHandler(0x8000, 0xFFFF, M432Read);
|
|
SetWriteHandler(0x6000, 0x7FFF, M432Write);
|
|
}
|
|
|
|
void Mapper432_Init(CartInfo *info) {
|
|
GenMMC3_Init(info, 256, 256, 0, 0);
|
|
cwrap = M432CW;
|
|
pwrap = M432PW;
|
|
info->Power = M432Power;
|
|
info->Reset = M432Reset;
|
|
AddExState(EXPREGS, 3, 0, "EXPR");
|
|
}
|