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If it is unsigned representation (meaning high bit is not sign bit) then it is 7F which has a decimal equivalent of 127. If it is a signed number (meaning high bit is sign bit) then numbers range from decimal -64 to +63
It the power is d, where d is a signed integer, the decimal point moves d place to the right.
8 bits if unsigned, 9 bits if signed
A signed integer is one with either a plus or minus sign in front. That is it can be either positive or negative.An unsigned integer is assumed to be positive
-128 to 127, in two's-complement.