1 /* FCE Ultra - NES/Famicom Emulator
3 * Copyright notice for this file:
4 * Copyright (C) 2002 Xodnizel
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 //16 bits of ram in total
24 //only use bottom 4 bits as ram though
25 static uint8 mapper228_ram[4];
27 static DECLFR(Mapper228_read)
29 return mapper228_ram[A & 3] & 0xF;
32 static DECLFW(Mapper228_write)
34 uint32 page,pagel,pageh;
39 mapper228_ram[A & 3] = V;
42 MIRROR_SET((A>>13)&1);
48 pagel=pageh=(page<<1) + (((A>>6)&1)&((A>>5)&1));
51 ROM_BANK16(0x8000,pagel);
52 ROM_BANK16(0xC000,pageh);
53 VROM_BANK8( (V&0x3) | ((A&0xF)<<2) );
56 static void A52Reset(void)
58 Mapper228_write(0x8000, 0);
61 void Mapper228_init(void)
65 SetWriteHandler(0x8000, 0xFFFF, Mapper228_write);
66 SetWriteHandler(0x4020, 0x5FFF, Mapper228_write);
67 SetReadHandler (0x4020, 0x5FFF, Mapper228_read);
68 AddExState(mapper228_ram, 4, 0, "MRAM");