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