asm core fix for Flintstones
[fceu.git] / mappers / 230.c
CommitLineData
d97315ac 1/* FCE Ultra - NES/Famicom Emulator
2 *
3 * Copyright notice for this file:
4 * Copyright (C) 2003 CaH4e3
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include "mapinc.h"
22
23#define rom_sw mapbyte1[0]
24
25void Mapper230_Reset(void)
26{
27 rom_sw ^= 1; //1 - rom_sw;
28
29 if( rom_sw ) {
30 ROM_BANK16(0x8000,0);
31 ROM_BANK16(0xc000,7);
32 } else {
33 ROM_BANK16(0x8000,8);
34 ROM_BANK16(0xc000,39);
35 }
36 MIRROR_SET2(1);
37}
38
39static DECLFW(Mapper230_write)
40{
41 if( rom_sw ) {
42 ROM_BANK16( 0x8000, V&0x07 );
43 } else {
44 if( V & 0x20 ) {
45 ROM_BANK16( 0x8000, (V&0x1F)+8 );
46 ROM_BANK16( 0xc000, (V&0x1F)+8 );
47 } else {
48 ROM_BANK32( ((V&0x1E) >> 1) + 4 );
49 }
50 MIRROR_SET2( ((V & 0x40) >> 6) );
51 }
52}
53
54void Mapper230_init(void)
55{
56 ROM_BANK16(0x8000,0);
57 ROM_BANK16(0xc000,7);
58 SetWriteHandler(0x8000, 0xffff, Mapper230_write);
59 MapperReset = Mapper230_Reset;
60 rom_sw = 1;
61}
62