d97315ac |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2005 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 | #include "mmc3.h" |
23 | |
24 | static uint8 cmdin; |
25 | static uint8 UNL8237_perm[8] = {0, 2, 6, 1, 7, 3, 4, 5}; |
26 | |
27 | static void UNL8237CW(uint32 A, uint8 V) |
28 | { |
29 | setchr1(A,((EXPREGS[1]&4)<<6)|V); |
30 | } |
31 | |
32 | static void UNL8237PW(uint32 A, uint8 V) |
33 | { |
34 | if(EXPREGS[0]&0x80) |
35 | { |
36 | if(EXPREGS[0]&0x20) |
37 | setprg32(0x8000,(EXPREGS[0]&0xF)>>1); |
38 | else |
39 | { |
40 | setprg16(0x8000,(EXPREGS[0]&0x1F)); |
41 | setprg16(0xC000,(EXPREGS[0]&0x1F)); |
42 | } |
43 | } |
44 | else |
45 | setprg8(A,V&0x3F); |
46 | } |
47 | |
48 | static DECLFW(UNL8237Write) |
49 | { |
50 | if((A&0xF000)==0xF000) |
51 | IRQCount=V; |
52 | else if((A&0xF000)==0xE000) |
53 | X6502_IRQEnd(FCEU_IQEXT); |
54 | else switch(A&0xE001) |
55 | { |
56 | case 0x8000: setmirror(((V|(V>>7))&1)^1); break; |
57 | case 0xA000: MMC3_CMDWrite(0x8000,(V&0xC0)|(UNL8237_perm[V&7])); cmdin=1; break; |
58 | case 0xC000: if(cmdin) |
59 | { |
60 | MMC3_CMDWrite(0x8001,V); |
61 | cmdin=0; |
62 | } |
63 | break; |
64 | } |
65 | } |
66 | |
67 | static DECLFW(UNL8237ExWrite) |
68 | { |
69 | switch(A) |
70 | { |
71 | case 0x5000: EXPREGS[0]=V; FixMMC3PRG(MMC3_cmd); break; |
72 | case 0x5001: EXPREGS[1]=V; FixMMC3CHR(MMC3_cmd); break; |
73 | } |
74 | } |
75 | |
76 | static void UNL8237Power(void) |
77 | { |
78 | IRQa=1; |
79 | EXPREGS[0]=EXPREGS[1]=0; |
80 | GenMMC3Power(); |
81 | SetWriteHandler(0x8000,0xFFFF,UNL8237Write); |
82 | SetWriteHandler(0x5000,0x7FFF,UNL8237ExWrite); |
83 | } |
84 | |
85 | void UNL8237_Init(CartInfo *info) |
86 | { |
87 | GenMMC3_Init(info, 256, 256, 0, 0); |
88 | cwrap=UNL8237CW; |
89 | pwrap=UNL8237PW; |
90 | info->Power=UNL8237Power; |
91 | AddExState(EXPREGS, 3, 0, "EXPR"); |
92 | AddExState(&cmdin, 1, 0, "CMDIN"); |
93 | } |