merge mapper code from FCEUX
[fceu.git] / boards / KS7032.c
1 /* FCE Ultra - NES/Famicom Emulator\r
2  *\r
3  * Copyright notice for this file:\r
4  *  Copyright (C) 2007 CaH4e3\r
5  *\r
6  * This program is free software; you can redistribute it and/or modify\r
7  * it under the terms of the GNU General Public License as published by\r
8  * the Free Software Foundation; either version 2 of the License, or\r
9  * (at your option) any later version.\r
10  *\r
11  * This program is distributed in the hope that it will be useful,\r
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
14  * GNU General Public License for more details.\r
15  *\r
16  * You should have received a copy of the GNU General Public License\r
17  * along with this program; if not, write to the Free Software\r
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
19  *\r
20  * FDS Conversion\r
21  *\r
22  */\r
23 \r
24 #include "mapinc.h"\r
25 \r
26 static uint8 reg[8], cmd, IRQa = 0, isirqused = 0;\r
27 static int32 IRQCount;\r
28 \r
29 static SFORMAT StateRegs[]=\r
30 {\r
31   {&cmd, 1, "CMD"},\r
32   {reg, 8, "REGS"},\r
33   {&IRQa, 1, "IRQA"},\r
34   {&IRQCount, 4, "IRQC"},\r
35   {0}\r
36 };\r
37 \r
38 static void Sync(void)\r
39 {\r
40   setprg8(0x6000,reg[4]);\r
41   setprg8(0x8000,reg[1]);\r
42   setprg8(0xA000,reg[2]);\r
43   setprg8(0xC000,reg[3]);\r
44   setprg8(0xE000,~0);\r
45   setchr8(0);\r
46 }\r
47 \r
48 static DECLFW(UNLKS7032Write)\r
49 {\r
50 //  FCEU_printf("bs %04x %02x\n",A,V);\r
51   switch(A&0xF000)\r
52   {\r
53 //    case 0x8FFF: reg[4]=V; Sync(); break;\r
54     case 0x8000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x000F)|(V&0x0F); isirqused = 1; break;\r
55     case 0x9000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x00F0)|((V&0x0F)<<4); isirqused = 1; break;\r
56     case 0xA000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x0F00)|((V&0x0F)<<8); isirqused = 1; break;\r
57     case 0xB000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0xF000)|(V<<12); isirqused = 1; break;\r
58     case 0xC000: if(isirqused) { X6502_IRQEnd(FCEU_IQEXT); IRQa=1; } break;\r
59     case 0xE000: cmd=V&7; break;\r
60     case 0xF000: reg[cmd]=V; Sync(); break;\r
61   }\r
62 }\r
63 \r
64 static void FP_FASTAPASS(1) UNLSMB2JIRQHook(int a)\r
65 {\r
66   if(IRQa)\r
67   {\r
68     IRQCount+=a;\r
69     if(IRQCount>=0xFFFF)\r
70     {\r
71       IRQa=0;\r
72       IRQCount=0;\r
73       X6502_IRQBegin(FCEU_IQEXT);\r
74     }\r
75   }\r
76 }\r
77 \r
78 static void UNLKS7032Power(void)\r
79 {\r
80   Sync();\r
81   SetReadHandler(0x6000,0x7FFF,CartBR);\r
82   SetReadHandler(0x8000,0xFFFF,CartBR);\r
83   SetWriteHandler(0x4020,0xFFFF,UNLKS7032Write);\r
84 }\r
85 \r
86 static void StateRestore(int version)\r
87 {\r
88   Sync();\r
89 }\r
90 \r
91 void UNLKS7032_Init(CartInfo *info)\r
92 {\r
93   info->Power=UNLKS7032Power;\r
94   MapIRQHook=UNLSMB2JIRQHook;\r
95   GameStateRestore=StateRestore;\r
96   AddExState(&StateRegs, ~0, 0, 0);\r
97 }\r