e2d0dd92 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Xodnizel |
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 | static uint8 FFEmode; |
24 | |
25 | #define FVRAM_BANK8(A,V) {VPage[0]=VPage[1]=VPage[2]=VPage[3]=VPage[4]=VPage[5]=VPage[6]=VPage[7]=V?&MapperExRAM[(V)<<13]-(A):&CHRRAM[(V)<<13]-(A);CHRBankList[0]=((V)<<3);CHRBankList[1]=((V)<<3)+1;CHRBankList[2]=((V)<<3)+2;CHRBankList[3]=((V)<<3)+3;CHRBankList[4]=((V)<<3)+4;CHRBankList[5]=((V)<<3)+5;CHRBankList[6]=((V)<<3)+6;CHRBankList[7]=((V)<<3)+7;PPUCHRRAM=0xFF;} |
26 | |
27 | static void FP_FASTAPASS(1) FFEIRQHook(int a) |
28 | { |
29 | if(IRQa) |
30 | { |
31 | IRQCount+=a; |
32 | if(IRQCount>=0x10000) |
33 | { |
34 | X6502_IRQBegin(FCEU_IQEXT); |
35 | IRQa=0; |
36 | IRQCount=0; |
37 | } |
38 | } |
39 | } |
40 | |
41 | DECLFW(Mapper6_write) |
42 | { |
43 | if(A<0x8000) |
44 | { |
45 | switch(A){ |
46 | case 0x42FF:MIRROR_SET((V>>4)&1);break; |
47 | case 0x42FE:onemir((V>>3)&2); FFEmode=V&0x80;break; |
48 | case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break; |
49 | case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break; |
50 | case 0x4503:IRQCount&=0xFF;IRQCount|=V<<8;IRQa=1;break; |
51 | } |
52 | } else { |
53 | switch (FFEmode) |
54 | { |
55 | case 0x80: setchr8(V); break; |
56 | default: ROM_BANK16(0x8000,V>>2); |
57 | FVRAM_BANK8(0x0000,V&3); |
58 | } |
59 | } |
60 | } |
61 | void Mapper6_StateRestore(int version) |
62 | { |
63 | int x; |
64 | for(x=0;x<8;x++) |
65 | if(PPUCHRRAM&(1<<x)) |
66 | { |
67 | if(CHRBankList[x]>7) |
68 | VPage[x]=&MapperExRAM[(CHRBankList[x]&31)*0x400]-(x*0x400); |
69 | else VPage[x]=&CHRRAM[(CHRBankList[x]&7)*0x400]-(x*0x400); |
70 | } |
71 | } |
72 | void Mapper6_init(void) |
73 | { |
74 | MapIRQHook=FFEIRQHook; |
75 | ROM_BANK16(0xc000,7); |
76 | |
77 | SetWriteHandler(0x4020,0x5fff,Mapper6_write); |
78 | SetWriteHandler(0x8000,0xffff,Mapper6_write); |
79 | MapStateRestore=Mapper6_StateRestore; |
80 | } |