A memory unit can store one byte. Only bytes have addresses, not bits.

A byte is an 8-bit binary number, and what you actually see is hexadecimal.

8-bit binary is converted into hexadecimal to two digits. For example, the maximum eight-digit binary number is 11111111, which is ff when converted to hexadecimal. .

The computer only recognizes 11111111, but what you see is ff