1 /* FCEUmm - NES/Famicom Emulator
2 *
3 * Copyright notice for this file:
4 * Copyright (C) 2020 negativeExponent
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21 /* NES 2.0 Mapper 390 - Realtec 8031 */
22
23 #include "mapinc.h"
24
25 static uint8 regs[2];
26 static uint8 dipswitch;
27
28 static SFORMAT StateRegs[] =
29 {
30 { ®s, 2, "REG" },
31 { &dipswitch, 1, "DPSW" },
32 { 0 }
33 };
34
Sync(void)35 static void Sync(void) {
36 switch ((regs[1] >> 4) & 3) {
37 case 0:
38 case 1:
39 /* UNROM */
40 setprg16(0x8000, regs[1]);
41 setprg16(0xC000, regs[1] | 7);
42 break;
43 case 2:
44 /* Maybe unused, NROM-256? */
45 setprg32(0x8000, regs[1] >> 1);
46 break;
47 case 3:
48 /* NROM-128 */
49 setprg16(0x8000, regs[1]);
50 setprg16(0xC000, regs[1]);
51 break;
52 }
53 setchr8(regs[0]);
54 setmirror(((regs[0] & 0x20) >> 5) ^ 1);
55 }
56
DECLFR(M390Read)57 static DECLFR(M390Read) {
58 uint8 ret = CartBR(A);
59 if ((regs[1] & 0x30) == 0x10)
60 ret |= dipswitch;
61 return ret;
62 }
63
DECLFW(M390Write)64 static DECLFW(M390Write) {
65 regs[(A >> 14) & 1] = A & 0x3F;
66 Sync();
67 }
68
M390Power(void)69 static void M390Power(void) {
70 regs[0] = 0;
71 regs[1] = 0;
72 dipswitch = 11; /* hard-coded 150-in-1 menu */
73 Sync();
74 SetReadHandler(0x8000, 0xffff, M390Read);
75 SetWriteHandler(0x8000, 0xffff, M390Write);
76 }
77
M390Reset(void)78 static void M390Reset(void) {
79 dipswitch = 11; /* hard-coded 150-in-1 menu */
80 Sync();
81 }
82
StateRestore(int version)83 static void StateRestore(int version) {
84 Sync();
85 }
86
Mapper390_Init(CartInfo * info)87 void Mapper390_Init(CartInfo *info) {
88 info->Reset = M390Reset;
89 info->Power = M390Power;
90 GameStateRestore = StateRestore;
91 AddExState(&StateRegs, ~0, 0, 0);
92 }
93