89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* FCEUmm - NES/Famicom Emulator
|
||
*
|
||
* Copyright notice for this file:
|
||
* Copyright (C) 2022 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
|
||
*/
|
||
|
||
/* NES 2.0 Mapper 410 is a variant of mapper 45 where the
|
||
* ASIC's PRG A21/CHR A20 output (set by bit 6 of the third write to $6000)
|
||
* selects between regularly-banked CHR-ROM (=0) and 8 KiB of unbanked CHR-RAM (=1).
|
||
* It is used solely for the Super 8-in-1 - 98格鬥天王＋熱血 (JY-302) multicart.
|
||
*/
|
||
|
||
#include "mapinc.h"
|
||
#include "mmc3.h"
|
||
|
||
static uint8 *CHRRAM;
|
||
|
||
static void M410CW(uint32 A, uint8 V) {
|
||
if (!(EXPREGS[2] & 0x40)) {
|
||
uint32 NV = V;
|
||
NV &= (1 << ((EXPREGS[2] & 7) + 1)) - 1;
|
||
NV |= EXPREGS[0] | ((EXPREGS[2] & 0xF0) << 4);
|
||
setchr1(A, NV);
|
||
} else
|
||
setchr8r(0x10, 0);
|
||
}
|
||
|
||
static void M410PW(uint32 A, uint8 V) {
|
||
uint32 MV = V & ((EXPREGS[3] & 0x3F) ^ 0x3F);
|
||
MV |= EXPREGS[1];
|
||
MV |= ((EXPREGS[2] & 0x40) << 2);
|
||
setprg8(A, MV);
|
||
/* FCEU_printf("1:%02x 2:%02x 3:%02x A=%04x V=%03x\n",EXPREGS[1],EXPREGS[2],EXPREGS[3],A,MV); */
|
||
}
|
||
|
||
static DECLFW(M410Write) {
|
||
EXPREGS[EXPREGS[4]] = V;
|
||
EXPREGS[4] = (EXPREGS[4] + 1) & 3;
|
||
FixMMC3PRG(MMC3_cmd);
|
||
FixMMC3CHR(MMC3_cmd);
|
||
}
|
||
|
||
static void M410Close(void) {
|
||
GenMMC3Close();
|
||
if (CHRRAM)
|
||
FCEU_free(CHRRAM);
|
||
CHRRAM = NULL;
|
||
}
|
||
|
||
static void M410Reset(void) {
|
||
EXPREGS[0] = EXPREGS[1] = EXPREGS[3] = EXPREGS[4] = 0;
|
||
EXPREGS[2] = 0x0F;
|
||
MMC3RegReset();
|
||
}
|
||
|
||
static void M410Power(void) {
|
||
GenMMC3Power();
|
||
EXPREGS[0] = EXPREGS[1] = EXPREGS[3] = EXPREGS[4] = 0;
|
||
EXPREGS[2] = 0x0F;
|
||
SetWriteHandler(0x6000, 0x7FFF, M410Write);
|
||
}
|
||
|
||
void Mapper410_Init(CartInfo *info) {
|
||
GenMMC3_Init(info, 512, 256, 8, info->battery);
|
||
cwrap = M410CW;
|
||
pwrap = M410PW;
|
||
info->Reset = M410Reset;
|
||
info->Power = M410Power;
|
||
info->Close = M410Close;
|
||
AddExState(EXPREGS, 5, 0, "EXPR");
|
||
|
||
CHRRAM = (uint8*)FCEU_gmalloc(8192);
|
||
SetupCartCHRMapping(0x10, CHRRAM, 8192, 1);
|
||
AddExState(CHRRAM, 8192, 0, "CRAM");
|
||
} |