asm compatibility re-fixed, nsf for asm fixed, msg displ
[fceu.git] / mappers / 234.c
CommitLineData
c62d2810 1/* FCE Ultra - NES/Famicom Emulator
2 *
3 * Copyright notice for this file:
d97315ac 4 * Copyright (C) 2002 Xodnizel
c62d2810 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 r1 mapbyte1[0]
24#define r2 mapbyte1[1]
25
26static void DoBS(void)
27{
28 if(r1&0x40)
29 {
30 ROM_BANK32((r1&0xE)|(r2&1));
31 VROM_BANK8( ((r1&0xE)<<2) | ((r2>>4)&7) );
32 }
33 else
34 {
35 ROM_BANK32(r1&0xF);
36 VROM_BANK8( ((r1&0xF)<<2) | ((r2>>4)&3) );
37 }
38}
39
40static void R1Set(uint8 V)
41{
42 if(r1) return;
43 r1=V;
44 MIRROR_SET(V>>7);
45 DoBS();
46}
47
48static void R2Set(uint8 V)
49{
50 r2=V;
51 DoBS();
52}
53
54DECLFW(R1W)
55{
56 R1Set(V);
57}
58
59DECLFR(R1R)
60{
61 uint8 r=CartBR(A);
62 R1Set(r);
63 return r;
64}
65
66DECLFW(R2W)
67{
68 R2Set(V);
69}
70
71DECLFR(R2R)
72{
73 uint8 r=CartBR(A);
74 R2Set(r);
75 return r;
76}
77
78static void M15Restore(int version)
79{
80 DoBS();
81 MIRROR_SET(r1>>7);
82}
83
84static void M15Reset(void)
85{
86 r1=r2=0;
87 DoBS();
88 MIRROR_SET(0);
89}
90
91void Mapper234_init(void)
92{
93 SetWriteHandler(0xff80,0xff9f,R1W);
d97315ac 94 SetReadHandler(0xff80,0xff9f,R1R);
c62d2810 95
d97315ac 96 SetWriteHandler(0xffe8,0xfff7,R2W);
97 SetReadHandler(0xffe8,0xfff7,R2R);
c62d2810 98
d97315ac 99 SetReadHandler(0x6000,0x7FFF,0);
100 SetWriteHandler(0x6000,0x7FFF,0);
c62d2810 101
d97315ac 102 M15Reset();
c0bf6f9f 103
d97315ac 104 GameStateRestore=M15Restore;
105 MapperReset=M15Reset;
c62d2810 106}
107