c62d2810 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 1998 BERO |
5 | * Copyright (C) 2002 Ben Parnell |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | */ |
21 | |
22 | #include "mapinc.h" |
23 | |
24 | static void FP_FASTAPASS(1) BandaiIRQHook(int a) |
25 | { |
26 | if(IRQa) |
27 | { |
28 | IRQCount-=a; |
29 | if(IRQCount<0) |
30 | { |
31 | X6502_IRQBegin(FCEU_IQEXT); |
32 | //printf("IRQ: %d, %d\n",scanline,timestamp); |
33 | IRQa=0; |
34 | IRQCount=0xFFFF; |
35 | } |
36 | } |
37 | } |
38 | |
39 | static DECLFW(Mapper16_write) |
40 | { |
41 | A&=0xF; |
42 | |
43 | if(A<=0x7) |
44 | VROM_BANK1(A<<10,V); |
45 | else if(A==0x8) |
c0bf6f9f |
46 | { |
c62d2810 |
47 | ROM_BANK16(0x8000,V); |
c0bf6f9f |
48 | X6502_Rebase(); |
49 | } |
c62d2810 |
50 | else switch(A) { |
51 | case 0x9: switch(V&3) { |
52 | case 0x00:MIRROR_SET2(1);break; |
53 | case 0x01:MIRROR_SET2(0);break; |
54 | case 0x02:onemir(0);break; |
55 | case 0x03:onemir(1);break; |
56 | } |
57 | break; |
58 | case 0xA:X6502_IRQEnd(FCEU_IQEXT); |
59 | IRQa=V&1; |
60 | IRQCount=IRQLatch; |
61 | break; |
62 | case 0xB:IRQLatch&=0xFF00; |
63 | IRQLatch|=V; |
64 | break; |
65 | case 0xC:IRQLatch&=0xFF; |
66 | IRQLatch|=V<<8; |
67 | break; |
68 | case 0xD: break;/* Serial EEPROM control port */ |
69 | } |
70 | } |
71 | |
72 | // Famicom jump 2: |
73 | // 0-7: Lower bit of data selects which 256KB PRG block is in use. |
74 | // This seems to be a hack on the developers' part, so I'll make emulation |
75 | // of it a hack(I think the current PRG block would depend on whatever the |
76 | // lowest bit of the CHR bank switching register that corresponds to the |
77 | // last CHR address read). |
78 | |
79 | static void PRGO(void) |
80 | { |
81 | uint32 base=(mapbyte1[0]&1)<<4; |
82 | ROM_BANK16(0x8000,(mapbyte2[0]&0xF)|base); |
83 | ROM_BANK16(0xC000,base|0xF); |
c0bf6f9f |
84 | X6502_Rebase(); |
c62d2810 |
85 | } |
86 | |
87 | static DECLFW(Mapper153_write) |
88 | { |
89 | A&=0xF; |
c0bf6f9f |
90 | if(A<=0x7) |
c62d2810 |
91 | { |
92 | mapbyte1[A&7]=V; |
93 | PRGO(); |
94 | } |
c0bf6f9f |
95 | else if(A==0x8) |
c62d2810 |
96 | { |
97 | mapbyte2[0]=V; |
98 | PRGO(); |
99 | } |
100 | else switch(A) { |
101 | case 0x9: switch(V&3) { |
102 | case 0x00:MIRROR_SET2(1);break; |
103 | case 0x01:MIRROR_SET2(0);break; |
104 | case 0x02:onemir(0);break; |
105 | case 0x03:onemir(1);break; |
106 | } |
107 | break; |
108 | case 0xA:X6502_IRQEnd(FCEU_IQEXT); |
109 | IRQa=V&1; |
110 | IRQCount=IRQLatch; |
111 | break; |
112 | case 0xB:IRQLatch&=0xFF00; |
113 | IRQLatch|=V; |
114 | break; |
115 | case 0xC:IRQLatch&=0xFF; |
116 | IRQLatch|=V<<8; |
117 | break; |
118 | } |
119 | } |
120 | |
121 | void Mapper16_init(void) |
122 | { |
123 | MapIRQHook=BandaiIRQHook; |
124 | SetWriteHandler(0x6000,0xFFFF,Mapper16_write); |
125 | } |
126 | |
127 | void Mapper153_init(void) |
128 | { |
129 | MapIRQHook=BandaiIRQHook; |
130 | SetWriteHandler(0x8000,0xFFFF,Mapper153_write); |
131 | /* This mapper/board seems to have WRAM at $6000-$7FFF, so I'll let the |
132 | main ines code take care of that memory region. */ |
133 | } |