urdoinitrong
The far-most right digit represents 1, then to the left of that is 2, then 4, 8, 16, 32, 64, 128. You started with 2 and ended with 256, which is wrong.
Those two numbers are 162 and 34, top to bottom. In addition, a number is only represented as positive or negative when it is a signed value, in which case only the right-most 7 bits are used to count, and the left-most is used to signify the positive or negative value. In this case, the value "1" in the highest-value bit (farthest to left) means the number is negative, and that bit is not used for calculating the value. In this case, the numbers are -34 and 34, respectively.
Remember, a single byte can only go up to 255, so the value of 324 would make no sense anyways.
http://en.wikipedia.org/wiki/Signed_num ... sentations