libretro/libretro-fceumm
1
0
Fork 0
mirror of https://github.com/libretro/libretro-fceumm.git synced 2024-12-28 03:45:48 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add missing mapper 439

Browse Source
This commit is contained in:
libretroadmin 2024-05-24 06:56:09 +02:00
parent b8dbbcc5df
commit 78064f4a44
1 changed files with 73 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
src/boards/439.c Normal file
View File

@ -0,0 +1,73 @@
/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2023
*
* 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 439 denotes the YS2309 multicart PCB.
* Its UNIF MAPRs are BMC-DS-07 and BMC-K86B.
*/
#include "mapinc.h"
#include "latch.h"
static uint8 reg[2];
static void Sync(void)
{
setprg16(0x8000, ((reg[0] >> 1) & ~7) | latch.data & 7);
setprg16(0xC000, ((reg[0] >> 1) & ~7) | 7);
setchr8(0);
setmirror(((latch.data >> 7) & 1) ^ 1);
}
static DECLFW(M439WriteReg)
{
reg[A & 1] = V;
Sync();
}
static DECLFW(M439WriteLatch)
{
if (!(reg[0] & 0x80))
latch.data = (latch.data & ~7) | (V & 7);
else
latch.data = V;
Sync();
}
static void M439Reset(void)
{
reg[0] = reg[1] = ~0;
LatchHardReset();
}
static void M439Power(void)
{
reg[0] = reg[1] = ~0;
LatchPower();
SetWriteHandler(0x6000, 0x7FFF, M439WriteReg);
SetWriteHandler(0x8000, 0xFFFF, M439WriteLatch);
}
void Mapper439_Init(CartInfo *info)
{
Latch_Init(info, Sync, NULL, 0, 1);
info->Power = M439Power;
info->Reset = M439Reset;
AddExState(reg, 2, 0, "REGS");
}