80 lines
1.3 KiB
C++
80 lines
1.3 KiB
C++
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#include "mapinc.h"
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static uint8 mode;
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static uint8 DRegs[4];
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static SFORMAT StateRegs[]=
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{
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{DRegs, 4, "DREG"},
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{0}
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};
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static void Sync(void)
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{
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int base, bank;
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base = ((DRegs[0]^DRegs[1])&0x10)<<1;
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bank = (DRegs[2]^DRegs[3])&0x1f;
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if(DRegs[1]&0x08)
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{
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bank &= 0xfe;
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if(mode==0)
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{
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setprg16(0x8000,base+bank+1);
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setprg16(0xC000,base+bank+0);
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}
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else
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{
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setprg16(0x8000,base+bank+0);
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setprg16(0xC000,base+bank+1);
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}
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}
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else
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{
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if(DRegs[1]&0x04)
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{
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setprg16(0x8000,0x1f);
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setprg16(0xC000,base+bank);
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}
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else
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{
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setprg16(0x8000,base+bank);
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if(mode==0)
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setprg16(0xC000,0x20);
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else
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setprg16(0xC000,0x07);
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}
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}
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}
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static DECLFW(Mapper167_write)
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{
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DRegs[(A>>13)&0x03]=V;
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Sync();
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void Mapper166_init(void)
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{
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mode=1;
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DRegs[0]=DRegs[1]=DRegs[2]=DRegs[3]=0;
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Sync();
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SetWriteHandler(0x8000,0xFFFF,Mapper167_write);
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void Mapper167_init(void)
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{
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mode=0;
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DRegs[0]=DRegs[1]=DRegs[2]=DRegs[3]=0;
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Sync();
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SetWriteHandler(0x8000,0xFFFF,Mapper167_write);
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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