03 Sign, Magnitude, Twos Complement

Signed

Signed values can be positive or negative. Computers use the first bit to indicate this. If the first bit is 1, the number is negative. If the first bit is 0, the number is positive. To determine the value of the number, the other 7 bits are used.

Hence for a signed 1000 0001, it will mean -1

Unsigned

Unsigned values will only be positive. Since there is no indication needed for whether the number is positive or negative, all 8 bits will be used to determine the value of the number.

For an unsigned 1000 0001, it will mean 129