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outportb(0x330,2);
for(i=0;i <512;i++)
{
pN=MK_FP(0x0d400,i);
*(unsigned char *)pN=distancedata[i];  // pre_data }
outportb(0x330,0);  //end pre
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outportb(0x330,2);
for(i=0;i <512;i++)
{
pN=MK_FP(0x0d400,i);
*(unsigned char *)pN=distancedata[i]; // pre_data }
outportb(0x330,0);  //end pre

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