64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* FCEUmm - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2023-2024 negativeExponent
|
|
*
|
|
* 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 "latch.h"
|
|
|
|
static void Sync(void) {
|
|
uint8 prg = ((latch.addr >> 3) & 0x20) | ((latch.addr >> 2) & 0x1F);
|
|
uint8 cpuA14 = latch.addr & 0x01;
|
|
uint8 nrom = (latch.addr >> 7) & 0x01;
|
|
uint8 unrom = (latch.addr >> 8) & 0x01;
|
|
|
|
setprg16(0x8000, ((prg & ~cpuA14) & ~(0x07 * unrom)) | (latch.data * unrom));
|
|
setprg16(0xC000, ((prg | cpuA14) & ~(0x1F * !nrom * !unrom)) | (0x07 * unrom));
|
|
SetupCartCHRMapping(0, CHRptr[0], 0x2000, latch.addr &0x80? 0: 1);
|
|
setchr8(0);
|
|
setmirror(((latch.addr >> 1) & 0x01) ^ 0x01);
|
|
}
|
|
|
|
static DECLFW(M454Write) {
|
|
if (latch.addr & 0x100) {
|
|
latch.data = V & 0x07;
|
|
} else {
|
|
latch.data = V;
|
|
latch.addr = A;
|
|
}
|
|
Sync();
|
|
}
|
|
|
|
static void M454Power(void) {
|
|
LatchPower();
|
|
SetWriteHandler(0x8000, 0xFFFF, M454Write);
|
|
}
|
|
|
|
static void M454Reset(void) {
|
|
latch.addr = 0;
|
|
latch.data = 0;
|
|
Sync();
|
|
}
|
|
|
|
void Mapper454_Init(CartInfo *info) {
|
|
Latch_Init(info, Sync, NULL, 0, 0);
|
|
info->Power = M454Power;
|
|
info->Reset = M454Reset;
|
|
}
|