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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 |
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | * FFE |
21 | * |
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22 | */ |
23 | |
24 | #include "mapinc.h" |
25 | |
26 | static uint8 FFEmode; |
27 | |
28 | #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;} |
29 | |
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30 | static void FP_FASTAPASS(1) FFEIRQHook(int a) |
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31 | { |
32 | if(IRQa) |
33 | { |
34 | IRQCount+=a; |
35 | if(IRQCount>=0x10000) |
36 | { |
37 | X6502_IRQBegin(FCEU_IQEXT); |
38 | IRQa=0; |
39 | IRQCount=0; |
40 | } |
41 | } |
42 | } |
43 | |
44 | DECLFW(Mapper6_write) |
45 | { |
46 | if(A<0x8000) |
47 | { |
48 | switch(A){ |
49 | case 0x42FF:MIRROR_SET((V>>4)&1);break; |
50 | case 0x42FE:onemir((V>>3)&2); FFEmode=V&0x80;break; |
51 | case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break; |
52 | case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break; |
53 | case 0x4503:IRQCount&=0xFF;IRQCount|=V<<8;IRQa=1;break; |
54 | } |
55 | } else { |
56 | switch (FFEmode) |
57 | { |
58 | case 0x80: setchr8(V); break; |
59 | default: ROM_BANK16(0x8000,V>>2); |
60 | FVRAM_BANK8(0x0000,V&3); |
61 | } |
62 | } |
63 | } |
64 | void Mapper6_StateRestore(int version) |
65 | { |
66 | int x; |
67 | for(x=0;x<8;x++) |
68 | if(PPUCHRRAM&(1<<x)) |
69 | { |
70 | if(CHRBankList[x]>7) |
71 | VPage[x]=&MapperExRAM[(CHRBankList[x]&31)*0x400]-(x*0x400); |
72 | else VPage[x]=&CHRRAM[(CHRBankList[x]&7)*0x400]-(x*0x400); |
73 | } |
74 | } |
75 | void Mapper6_init(void) |
76 | { |
77 | MapIRQHook=FFEIRQHook; |
78 | ROM_BANK16(0xc000,7); |
79 | |
80 | SetWriteHandler(0x4020,0x5fff,Mapper6_write); |
81 | SetWriteHandler(0x8000,0xffff,Mapper6_write); |
82 | MapStateRestore=Mapper6_StateRestore; |
83 | } |