[CaptainDoggles]

Originally Posted by ZaltysZ

In affinity mask each bit represents one CPU: 1 value - use CPU, 0 value - don't. Bits are counted from right to left, so you need do the same with CPUs. In our case, that would be: 7, 6, 5, 4, 3, 2, 1, 0. Now replace wanted CPUs with 1s and unwanted with 0s. You will get: 0, 1, 0, 1, 0, 1, 0, 1 or simply 1010101. Convert that from binary to decimal (use Windows calculator) and get a mask of 85.

For those who enjoy math, the conversion from binary (base 2) to decimal (base 10) works out like this:

1010101 = 1*2^0 + 0*2^1 + 1*2^2 + 0*2^3 + 1*2^4 + 0*2^5 + 1*2^6
        =   1   +   0   +   4   +   0   +   16  +   0   +   64
        = 85