boards/subor.c

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