17ad461e7d
* m215: Fix support for submapper 1 cart * Switch UNL43272 to new Mapper242 implementation * Merge mappers BMC-70in1/B and 236 * Merge 58/213/GK-192 * Assign GS-2004/GS-2014 to mapper 283 * Cleanup Co-authored-by: negativeExponent <negativeExponent@users.noreply.github.com>
112 lines
2.1 KiB
C
112 lines
2.1 KiB
C
/* FCE Ultra - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2012 CaH4e3
|
|
*
|
|
* 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"
|
|
|
|
static uint8 reg[2];
|
|
static uint8 dip;
|
|
static uint8 chrramvariant;
|
|
static SFORMAT StateRegs[] =
|
|
{
|
|
{ reg, 2, "REG " },
|
|
{ &dip, 1, "DIP " },
|
|
{ 0 }
|
|
};
|
|
|
|
static void Sync(void)
|
|
{
|
|
int prg;
|
|
int chr;
|
|
if (chrramvariant)
|
|
{
|
|
prg = reg[1] &7 | reg[0] <<3;
|
|
chr = 0;
|
|
}
|
|
else
|
|
{
|
|
prg = reg[1] & 0x0F;
|
|
chr = reg[0] & 0x0F;
|
|
}
|
|
switch (reg[1] >>4 &3)
|
|
{
|
|
case 0:
|
|
case 1:
|
|
setprg16(0x8000, prg);
|
|
setprg16(0xC000, prg |7);
|
|
break;
|
|
case 2:
|
|
setprg32(0x8000, prg >>1);
|
|
break;
|
|
case 3:
|
|
setprg16(0x8000, prg);
|
|
setprg16(0xC000, prg);
|
|
break;
|
|
}
|
|
setchr8(chr);
|
|
setmirror((reg[0] >>5 &1) ^1);
|
|
}
|
|
|
|
static DECLFR(M236Read)
|
|
{
|
|
if ((reg[1] >>4 &3) ==1)
|
|
return CartBR(A &~0xF | dip &0xF);
|
|
else
|
|
return CartBR(A);
|
|
}
|
|
|
|
static DECLFW(M236WriteReg)
|
|
{
|
|
reg[A >>14 &1] =A &0xFF;
|
|
Sync();
|
|
}
|
|
|
|
static void M236Power(void)
|
|
{
|
|
dip = 0;
|
|
reg[0] = 0;
|
|
reg[1] = 0;
|
|
Sync();
|
|
SetWriteHandler(0x8000, 0xFFFF, M236WriteReg);
|
|
SetReadHandler(0x8000, 0xFFFF, M236Read);
|
|
}
|
|
|
|
static void M236Reset(void)
|
|
{
|
|
++dip;
|
|
/* Soft-reset returns to menu */
|
|
reg[0] = 0;
|
|
reg[1] = 0;
|
|
Sync();
|
|
}
|
|
|
|
static void StateRestore(int version)
|
|
{
|
|
Sync();
|
|
}
|
|
|
|
void Mapper236_Init(CartInfo *info)
|
|
{
|
|
info->Power = M236Power;
|
|
info->Reset = M236Reset;
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
|
GameStateRestore = StateRestore;
|
|
chrramvariant = info->CHRRomSize == 0;
|
|
}
|