boards/subor.c

   1 #include "mapinc.h"\r
   2 \r
   3 static uint8 mode;\r
   4 static uint8 DRegs[4];\r
   5 \r
   6 static SFORMAT StateRegs[]=\r
   7 {\r
   8   {DRegs, 4, "DREG"},\r
   9   {0}\r
  10 };\r
  11 \r
  12 static void Sync(void)\r
  13 {\r
  14   int base, bank;\r
  15   base = ((DRegs[0]^DRegs[1])&0x10)<<1;\r
  16   bank = (DRegs[2]^DRegs[3])&0x1f;\r
  17 \r
  18   if(DRegs[1]&0x08)\r
  19   {\r
  20     bank &= 0xfe;\r
  21     if(mode==0)\r
  22     {\r
  23       setprg16(0x8000,base+bank+1);\r
  24       setprg16(0xC000,base+bank+0);\r
  25     }\r
  26     else\r
  27     {\r
  28       setprg16(0x8000,base+bank+0);\r
  29       setprg16(0xC000,base+bank+1);\r
  30     }\r
  31   }\r
  32   else\r
  33   {\r
  34     if(DRegs[1]&0x04)\r
  35     {\r
  36       setprg16(0x8000,0x1f);\r
  37       setprg16(0xC000,base+bank);\r
  38     }\r
  39     else\r
  40     {\r
  41       setprg16(0x8000,base+bank);\r
  42       if(mode==0)\r
  43          setprg16(0xC000,0x20);\r
  44       else\r
  45          setprg16(0xC000,0x07);\r
  46     }\r
  47   }\r
  48 }\r
  49 \r
  50 static DECLFW(Mapper167_write)\r
  51 {\r
  52   DRegs[(A>>13)&0x03]=V;\r
  53   Sync();\r
  54 }\r
  55 \r
  56 static void StateRestore(int version)\r
  57 {\r
  58   Sync();\r
  59 }\r
  60 \r
  61 void Mapper166_init(void)\r
  62 {\r
  63   mode=1;\r
  64   DRegs[0]=DRegs[1]=DRegs[2]=DRegs[3]=0;\r
  65   Sync();\r
  66   SetWriteHandler(0x8000,0xFFFF,Mapper167_write);\r
  67   GameStateRestore=StateRestore;\r
  68   AddExState(&StateRegs, ~0, 0, 0);\r
  69 }\r
  70 \r
  71 void Mapper167_init(void)\r
  72 {\r
  73   mode=0;\r
  74   DRegs[0]=DRegs[1]=DRegs[2]=DRegs[3]=0;\r
  75   Sync();\r
  76   SetWriteHandler(0x8000,0xFFFF,Mapper167_write);\r
  77   GameStateRestore=StateRestore;\r
  78   AddExState(&StateRegs, ~0, 0, 0);\r
  79 }\r